BIOLOGY 2401 - EXAM 3A

(18 pages)

SELECT THE MOST CORRECT ANSWER.

  1. The ability of a cell to respond to an environment change best describes
  1. the resting membrane potential
  2. polarized membranes
  3. excitability
  4. stimulus
  5. secondary response
  1. The secondary response of nervous tissue to an adequate stimulus is
  1. shortening
  2. a local potential
  3. an action potential
  4. release of a chemical
  5. depolarization
  1. An stimulus which would cause the initiation of an action potential must be
  1. electrical
  2. chemical
  3. any environmental change
  4. sufficiently intense
  5. changing very slowly in intensity
  1. The ability of an action potential to move from its points of origin to a distant point on a cell best defines
  1. depolarization
  2. conduction
  3. polarization
  4. differential permeability
  5. elecrochemical equilibria
  1. The voltage that can be measured across the membrane of all cells is the
  1. action potential
  2. conductance potential
  3. resting potential
  4. changing potential
  5. local potential
  1. The electrical potential measured across cell membranes is due to
  1. electron flow across the membrane
  2. charge separation due to positive protein
  3. unequal concentrations of ions across the membrane
  4. equal concentrations of oppositely charged ions across the membrane
  5. negative electrical poles on both sides of the membrane
  1. The majority of stimuli that occur naturally in the body are _____ in nature
  1. electrical
  2. mechanical
  3. chemical
  4. thermal
  5. nuclear
  1. At rest, the ionic concentration situation across the cell membrane is
  1. high potassium inside and high sodium inside
  2. low potassium inside and low sodium outside
  3. low potassium inside and low sodium inside
  4. high potassium inside and high sodium outside
  5. low potassium outside and low sodium outside
  1. During depolarization of a nerve cell
  1. sodium is flowing into the cell
  2. sodium is flowing out of the cell
  3. potassium is flowing out of the cell
  4. potassium is flowing into the cell
  5. sodium is flowing into the cell and potassium is flowing out of the cell
  1. Repolarization is brought about by
  1. an influx of sodium
  2. an eflux of sodium
  3. an influx of potassium
  4. an eflux of potassium
  5. an influx of calcium
  1. At the threshold point for a nerve or muscle cell
  1. chemically controlled gates for sodium channels are closing
  2. electrically controlled gates for sodium channels are closing
  3. chemically controlled gates for potassium channels are opening
  4. electrically controlled gates for sodium channels are opening
  5. chemically controlled gates for calcium are closing
  1. Local potentials
  1. result from the opening of the electrically controlled sodium gates
  2. are conducted over the entire cell membrane
  3. always reach threshold
  4. will result in an action potential if they reach threshold
  5. occur only on muscle cells

 

  1. The period of time in which an excitable cell is depolarized corresponds to the
  1. action potential
  2. refractory period
  3. threshold
  4. local potential
  5. resting state
  1. An excitable cell responds with a maximum response or no response is a statement of the
  1. all or none law
  2. Peter principle
  3. Dubios-Reymond law
  4. Ohmís law
  5. Thielengerdes hypothesis
  1. The muscle cell type with the longest refractory period would be the
  1. red skeletal muscle
  2. white skeletal muscle
  3. unitary smooth muscle
  4. multi-unit smooth muscle
  5. cardiac muscle
  1. The outer envelope of connective tissue that surrounds a muscle is the
  1. perimysium
  2. endomysium
  3. epimysium
  4. fasciculi
  5. muscle sheath
  1. From largest to smallest, which of the following sequence is correct?
  1. fiber, filament, fibril
  2. fibril, filament, fiber
  3. filament, fibril, fiber
  4. filament, fiber, fibril
  5. fiber, fibril, filament
  1. The portion of the sacromere which consists exclusively of thin filaments is the
  1. I band
  2. A band
  3. Z line
  4. H zone
  5. M line
  1. The bulk of the thin filament is composed of
  1. troponin
  2. tropomyosin
  3. myosin
  4. actin
  5. collagen
  1. In a relaxed sarcomere, thin filaments are attached to
  1. thick filaments
  2. myosin
  3. z lines
  4. troponin
  5. tropomyosin
  1. The portion of the sarcolemma that lies immediately beneath the nerve fiber is the
  1. transverse tubule
  2. sarcoplasmic reticulum
  3. motor end plate
  4. cisternae
  5. lateral sac
  1. The period of time following an action potential but before the contraction period begins is known as the
  1. refractory period
  2. contract delay time (latent period)
  3. depolarization period
  4. repolarization period
  5. mobilization period
  1. A given muscle will exert 50 grams of force during a single twitch. You would expect that this muscle would produce ___ grams of force during a tetanus contraction.
  1. 10
  2. 20
  3. 25
  4. 50
  5. 100
  1. According to the concept of initial length, a muscle which is stretched prior to stimulation will
  1. increase its force of contraction
  2. decrease itís force of contraction
  3. become refractory
  4. increase of decrease its force of contraction depending upon how much it is stretched
  5. show fatigue at an earlier period of time
  1. A given muscle is supplied by 500 motor neurons. It would contain ___ motor units.
  1. 100
  2. 200
  3. 300
  4. 500
  5. 1000
  1. Which of the following muscles would you expect to have the fewest number of muscle cells per motor unit?
  1. muscles of the lower leg
  2. muscles of the upper arm
  3. muscles of the hand
  4. muscles of the thorax
  5. muscles of the thigh
  1. The nerve impulse is transmitted across the myoneural junction by means of
  1. an electrical spark
  2. acetylcholine
  3. acetylcholinesterase
  4. calcium
  5. sodium
  1. Calcium is released from the sarcoplasmic reticulum by the action potential. Calcium then causes uncovering go the cross bridge binding sites by interacting with
  1. actin
  2. myosin
  3. troponin
  4. tropomyosin
  5. calmodulin
  1. During contraction, cross bridge attach to
  1. myosin
  2. troponin
  3. troponin
  4. actin
  5. calmodulin
  1. Relaxation of muscle occurs when
  1. calcium enters into the myofibrils
  2. calcium is pumped back into the sarcoplasmic reticulum
  3. the sarcolemma depolarizes
  4. troponin is converted back into tropomyosin
  5. myosin becomes an active enzyme
  1. Rigor mortis is due to the
  1. attachment of cross bridges to the thin filaments in the absence of ATP
  2. loss of calcium for the muscle cell
  3. attachment of cross bridge to the thin filaments fin the presence of ATP
  4. loss of the sarcoplasmic reticulum
  5. breakdown of the sarcolemma
  1. The secondary source of energy for muscle contraction is
  1. ATP
  2. GTP
  3. creatine phosphate
  4. glycogen
  5. glucose
  1. During anaerobic conditions, skeletal muscle can still generate energy by
  1. converting glucose into carbon dioxide and water
  2. converting pyruvic acid into lactic acid
  3. converting pyruvic acid into acetyl CoA
  4. utilizing GTP
  5. converting myosin into an ATPase
  1. Oxygen debt results from
  1. a loss of ATP from skeletal muscle
  2. conversion of acetyl CoA into carbon dioxide
  3. anaerobic generation of ATP
  4. over supply of oxygen to muscle during exercise
  5. the electron transport system
  1. Oxygen debt may be equated to
  1. oxygen levels in the blood
  2. oxygen levels in the muscles
  3. accumulation of lactid acid
  4. accumulation of pyruvic acid
  5. loss of calcium from the sarcoplasmic reticulum
  1. You would participate that a world class sprinter would have a high proportion of _______ muscle fibers.
  1. fast red
  2. slow white
  3. slow red
  4. fast white
  5. intermediate red
  1. Red muscle fibers are that color because they
  1. have low aerobic capacity
  2. contain high levels of calcium
  3. contain hemoglobin
  4. contain tropomyosin
  5. contain myoglobin
  1. The principal cause of muscle fatigue is
  1. loss of calcium
  2. loss of energy reserves
  3. depletion of myosin
  4. fatigue of actin
  5. fatigue of tropomyosin
  1. The equivalent of z lines smooth muscle are the
  1. myosin light chains
  2. dense bodies
  3. thin filaments
  4. thick filaments
  5. intermediate filaments
  1. The molecule which is found in skeletal muscle but is absent in smooth muscle is
  1. ATP
  2. tropomyosin
  3. actin
  4. myosin
  5. troponin
  1. During the contraction of smooth muscle, calcium enters the cell and combines with
  1. calmodulin
  2. myosin light chains
  3. troponin
  4. tropomyosin
  5. myosin
  1. The molecule which causes the transfer of phosphate groups to the myosin light chains is
  1. light chain phosphatase
  2. light chain kinase
  3. calmodulin
  4. troponin
  5. tropomyosin
  1. The source of calcium in smooth muscle is the sarcoplasmic reticulum and the
  1. myofibrils
  2. golgi apparatus
  3. extracellular fluid
  4. lysosome
  5. mitochondrion
  1. Multi-unit smooth muscle
  1. is completely different from skeletal muscle
  2. does not require innervation
  3. is found in the digestive tract
  4. receives innervation from autonomic nervous system
  5. is found in the uterus
  1. Unitary smooth muscle
  1. exhibits tetanus
  2. exhibits summation
  3. requires innervation
  4. exhibits ephatic conduction
  5. does not contain gap junction
  1. Conduction of the action potential from cell to cell by means of gap junctions best defines
  1. ephatic conduction
  2. saltatory conduction
  3. continuous conduction
  4. tetanus
  5. summation
  1. The ability of smooth muscle to be stretched and still retains its normal contractile force best defines
  1. plasticity
  2. initial length
  3. antagonism
  4. synergism
  5. myoability
  1. Muscles which are responsible for equal but opposite actions are described as being
  1. plastic
  2. multiple motor
  3. antagonistic
  4. synergistic
  5. prime movers
  1. A broad, sheet-like tendon best defines a (an)
  1. ligament
  2. fascia
  3. epimysium
  4. aponeuroses
  5. psychosis
  1. Generally speaking, muscle which attach to bones by fusing their epimysium with the periosteum of the bone are said to be attached
  1. indirectly
  2. directly
  3. by tendons
  4. by aponeuroses
  5. lightly
  1. The deltoid muscle has attachment points on the scapula and clavicle and one on the humerus. The insertion of this muscle would be
  1. on the scapula
  2. on the clavicle
  3. on the humerus
  4. between the scapula and humerus
  5. between the clavicle and scapula
  1. The attachment point of a muscle which shows the least movement would be
  1. a tendon
  2. an aponeuroses
  3. the origin
  4. the insertion
  5. the fascia
  1. Which of the following is a method by which muscles are named?
  1. epimysium composition
  2. weight
  3. origin and insertion
  4. fiber composition
  5. tendon length
  1. The muscle of a group which is principally responsible for the group action is termed a (an)
  1. antagonist
  2. primer mover
  3. synergist
  4. class A lever
  5. force displacement muscle
  1. Both the biceps brachialis play a role in flexing the forearm. The biceps provides most of the force. The brachialis would be an example of a (an)
  1. antagonist
  2. prime mover
  3. synergist
  4. silent muscle
  5. extensor
  1. Muscle exert their influence by
  1. pulling across joints
  2. pushing across joints
  3. pulling around joints
  4. lengthening
  5. pushing between joints
  1. Isotonic exercise causes muscle to
  1. hypertrophy
  2. increase their strength
  3. become shorter
  4. increase their endurance
  5. decrease the amount of blood they receive
  1. Myasthenia gravis results from
  1. transformation of white fibers into red fibers
  2. transformation of red fibers into white fibers
  3. an increase in the number of acetylcholine receptors
  4. a decrease in the number of acetylcholine receptors
  5. degeneration of the sarcoplasmic reticulum
  1. Muscular dystrophy is due to a missing protein which is
  1. myosin
  2. dystrophin
  3. tropomyosin
  4. troponin
  5. actin
  1. Which of the following would you expect to have the lowest percentage of their total body weight in the form of skeletal muscle?
  1. 20 year old man
  2. 20 year old woman
  3. 30 year old man
  4. 60 year old man
  5. 60 year old woman
  1. The muscle which is most responsible for raising the eyebrows is the
  1. temporalis
  2. frontalis
  3. buccinator
  4. gracilis
  5. internal oblique
  1. Kissing would primarily involve the use of the
  1. buccinator
  2. orbicularis oculi
  3. orbicularis oris
  4. temporalis
  5. frontalis
  1. The muscle which is primarily responsible for lowering of the head would be the
  1. buccinator
  2. sternocleidomastoid
  3. triceps
  4. deltoid
  5. pectoralis major

64. The muscle which is primarily responsible for the abducting of the arm would be

  1. pectoralis major
  2. deltoid
  3. biceps brachii
  4. triceps
  5. internal oblique
  1. Extending the leg would make use of the
  1. semimembranous
  2. semitendinous
  3. gastrocnemius
  4. rectus femoris
  5. serratus anterior
  1. The muscle used in crossing the legs would be the
  1. gracilis
  2. tibialis anterior
  3. gastrocnemia
  4. rectus femoris
  5. serratus anterior
  1. Flexing of the leg would involve the use of the
  1. gastrocnemius
  2. semimembraneous
  3. rectus femoris
  4. tibialis anterior
  5. internal oblique

 

 

BIOLOGY 2401- EXAMINATION 3C

CHOOSE THE MOST CORRECT ANSWER.

  1. Excitability
  1. is the ability of a cell to respond to a change in the environment
  2. is a characteristic of all cells
  3. is a speciality of muscle cells
  4. is a speciality of nerve cells
  5. more than one of the above is correct
  1. The initial response of an excitable tissue to an adequate stimulus is
  1. contraction
  2. the release of a chemical
  3. a change in length
  4. a change in the electrical characteristics of the membrane
  5. more than one of the above is correct
  1. The secondary response of nerve is
  1. initiation of a resting potential
  2. destruction of the resting potential
  3. an action potential
  4. depolarization
  5. the release of a chemical
  1. In order to initiate a response in an excitable cell, a stimulus must
  1. be sufficient in intensity
  2. be applied for a minimum amount of time
  3. have a sufficiently rapid change in intensity levels
  4. be electrical in nature
  5. more than one of the above is correct
  1. The ability of the initial response to move from the point of stimulus application across the membrane is termed
  1. excitability
  2. irritability
  3. conduction
  4. repolarization
  5. none of the above is correct
  1. A membrane that has an electrically negative side and an electrically positive side is
  1. polarized
  2. depolarized
  3. without an electrical potential
  4. incapable of initiating an action potential
  5. more than one of the above is correct
  1. Which of the following does not contribute to the resting membrane potential?
  1. differential membrane permeability
  2. ion concentrations
  3. active transport
  4. electrochemical equilibrium
  5. electron flow
  1. The predominate stimulus which activates excitable tissues in the body is _____ in nature
  1. thermal
  2. electrical
  3. chemical
  4. mechanical
  5. electromagnetic
  1. The depolarization phase of the action potential is brought about by the
  1. efflux of sodium
  2. efflux of potassium
  3. influx of sodium
  4. influx of potassium
  5. influx of calcium
  1. During repolarization, the membrane potential on the inside of the cell
  1. is becoming more positive
  2. is becoming more negative
  3. no longer exists
  4. is at 0 volts
  5. more than one of the above is correct
  1. Repolarization of the cell membrane is brought about by
  1. sodium moving into the cell
  2. sodium moving out of the cell
  3. potassium moving into the cell
  4. potassium moving out of the cell
  5. none of the above
  1. Following an action potential, the original ionic situation is restored by
  1. a net inward movement of sodium
  2. a net outward movement of potassium
  3. active transport of calcium
  4. active exchange of sodium and potassium
  5. none of the above
  1. The critical membrane at which an action potential will occur is termed the
  1. initial response
  2. secondary response
  3. threshold
  4. all or none response
  5. tetanus approach
  1. Whenever a local potential reaches the critical level, then a (an) _____ occur
  1. contraction
  2. action potential
  3. resting potential
  4. repolarization
  5. none of the above
  1. The refractory period represents that period of time when
  1. another action potential cannot be initiated
  2. the membrane is depolarized or only partially repolarized
  3. sodium is moving into the cell
  4. the membrane is not in a resting state
  5. more than one of the above is correct
  1. Which of the following cells would have the longest refractory period?
  1. neuron
  2. skeletal muscle
  3. smooth muscle
  4. cardiac muscle
  5. they are all essentially the same
  1. The muscle type in which each cell is individually innervated is
  1. involuntary
  2. smooth
  3. skeletal
  4. cardiac
  5. none of the above
  1. A bundle of skeletal muscle cells is termed a (an)
  1. epimysium
  2. endomysium
  3. fasciculis
  4. fiber
  5. muscle
  1. In skeletal muscle, each individual muscle cell is surrounded by a connective tissue envelope termed the
  1. epimysium
  2. perimysium
  3. endomysium
  4. endothelium
  5. myothelium
  1. The membrane of the skeletal muscle cell is termed the
  1. neurilemma
  2. plasmalemma
  3. sarcolemma
  4. sarcoplasmic reticulum
  5. none of the above
  1. Each myofibril is made up of
  1. sarcomeres
  2. myofilaments
  3. proteins
  4. A bands
  5. More than one of the above is correct
  1. The thin filaments have one end permanently attached to the
  1. sarcomere
  2. thick filaments
  3. A band
  4. Z line (membrane)
  5. I band
  1. The I bands are composed exclusively of
  1. thick filaments
  2. thin filaments
  3. Z membranes
  4. T Ė tubules
  5. More than one of the above is correct
  1. The thick filaments are composed of
  1. actin
  2. troponin
  3. tropomyosin
  4. myosin
  5. myosin and tropomyosin
  1. Immediately beneath the terminal filament of the neuron at the myoneural junction is found the
  1. motor end plates
  2. endoplasmic reticulum
  3. logitudinal tubule
  4. transverse tubule
  5. sarcomere
  1. The period of time immediately following the action potential but before the muscle contraction is termed the
  1. period of contraction
  2. period of relaxation
  3. refractory period
  4. contraction delay time
  5. none of the above
  1. A single stimulus to a muscle results in
  1. a muscle twitch
  2. tetanus
  3. summation
  4. treppe
  5. fatigue
  1. When stimuli are coming so rapidly that there is not time for a muscle to relax, the condition is termed
  1. summation
  2. twitching
  3. tetanus
  4. treppe
  5. multiple summation
  1. In the graph above, at which length is muscle contraction most efficient?
  1. 3 cm
  2. 5 cm
  3. 7 cm
  4. 9 cm
  5. 10 cm
  1. A given muscle is innervated by 1000 motor neurons. This muscle would contain ______ motor units
  1. 100
  2. 1000
  3. 10000
  4. 500
  5. cannot be determined from the information provided
  1. The local potentials which develop as a result of acetylcholine attaching to the sarcolemma are referred to as
  1. generator potentials
  2. miniature end plate potentials
  3. action potentials
  4. resting potentials
  5. major end plate potentials
  1. The release of calcium from the sarcoplasmic reticulum is triggered by
  1. contraction
  2. relaxation
  3. the action potential
  4. the local potential
  5. more than one of the above is correct
  1. Calcium initiates the attachment of the thin filaments to cross bridges of the thick filaments by
  1. breaking up the troponin-tropomyosin complex on the thin filaments
  2. conversion of myosin into an ATPase
  3. being released from the sarcoplasmic reticulum
  4. converting myosin into tropomyosin
  5. more than one of the above is correct
  1. Actual shortening of the muscle fiber occurs when
  1. the thin filaments slide inward
  2. the thick filaments slide outward
  3. myosin becomes inactive
  4. troponin converts into tropomyosin
  5. myosin converts into tropomyosin
  1. Contract in which tension develops but no shortening occurs is termed
  1. isotonic
  2. isobaric
  3. isometric
  4. hypotonic
  5. hypermetric
  1. Rigor mortis occurs when
  1. cross bridges to the thin filaments break
  2. cross bridges to the thin filaments lock on and ATP is present
  3. cross bridges to the thin filaments lock on and ATP is absent
  4. myosin decomposes
  5. none of the above is correct
  1. The initial source of energy for muscle contraction is
  1. ATP
  2. Creatine phosphate
  3. Glycogen
  4. Glucose
  5. More than one of the above is correct
  1. Anaerobic respiration in muscle occurs when
  1. glucose is converted into carbon dioxide and water
  2. glycogen is converted into carbon dioxide and water
  3. pyruvic acid is converted into carbon dioxide and water
  4. pyruvic acid is converted into lactic acid
  5. acetyl CoA is converted into citric acid
  1. Oxygen debt is equal to
  1. the amount of glucose metabolized by muscle
  2. lactic acid minus ATP generated by anaerobic metabolism
  3. pyruvic acid formed in muscle
  4. lactic acid formed in muscle
  5. none of the above
  1. If your goal was to be a world class sprinter, you would hope that your were born with a high percentage of ______ muscle fibers
  1. slow twitch red
  2. fast twitch red
  3. fast twitch white
  4. slow twitch white
  5. fast twitch purple
  1. Compared to skeletal muscle cells, smooth muscle cells
  1. are smaller
  2. are uninucleate
  3. lack striations
  4. have a very high capacity of anaerobic metabolism
  5. more than one of the above is correct
  1. Smooth muscle contains
  1. myosin light chains
  2. intermediate filaments
  3. myosin thick filaments
  4. thin filaments
  5. more than one of the above is correct
  1. In smooth muscle, the equivalent of the Z membrane is the
  1. intermediate filament
  2. myosin thick filament
  3. thin filament
  4. myosin light chain
  5. dense body
  1. During smooth muscle contraction, calcium moving into the cell first binds with
  1. myosin light chains
  2. dense bodies
  3. calmodulin
  4. myosin light chain kinase
  5. myosin light chain phosphatase
  1. In smooth muscle, thin and thick filaments separate when
  1. calmodulin is activated
  2. phosphate groups are transferred to myosin light chains
  3. myosin light chain kinase becomes active
  4. myosin light chain phosphatase causes the removal of phosphate from myosin light chains
  5. more than one of the above is correct
  1. Multiunit smooth muscle is found in
  1. walls of blood vessels
  2. iris of the eye
  3. ciliary muscle of the eye
  4. uterus
  5. more than one of the above is correct
  1. The mechanism of ephatic junction is
  1. the hypersensitivity of smooth muscle cells
  2. the efflux of calcium that occurs prior to contraction
  3. the presence of gap junctions between adjacent cells
  4. the influx of sodium that occurs prior to contraction
  5. none of the above is correct
  1. The ability of smooth muscle to stretch and still maintain its normal fore of contraction is referred to as
  1. ephatic conduction
  2. pacemaker activity
  3. plasticity
  4. initial length
  5. more than one of the above is correct
  1. In the arm, the biceps causes flexion while the triceps causes extention. The relationship between these two muscles is termed
  1. synergistic
  2. prime mover
  3. unrelated
  4. antagonistic
  5. optomistic
  1. The disease myasthenia gravis is due to
  1. loss of acetylcholine
  2. loss of acetylcholinesterase
  3. loss of acetylcholine receptors
  4. overproduction of acetylcholine
  5. none of the above
  1. When a muscle is directly attached to a bone
  1. it is connected via a tendon
  2. it is connected via an aponeurosis
  3. its epimysium is fused directly with the periosteum of the bone
  4. the bone is inside of the muscle
  5. more than one of the above is correct
  1. The attachment point of a muscle which shows the most movement is the
  1. origin
  2. insertion
  3. tendon end
  4. direct attachment point
  5. aponeurosis end
  1. Which of the following is not a method by which muscles are named?
  1. size
  2. number of heads of origin
  3. location
  4. origin and insertion
  5. color
  1. In a group action, the muscles which aid in the movement but are not primarily responsible for it are termed
  1. prime movers
  2. secondary movers
  3. synergists
  4. holistic
  5. none of the above
  1. Isotonic exercise causes muscles to
  1. become larger
  2. become stronger
  3. increase their aerobic capacity
  4. hypertrophy
  5. more than one of the above is correct
  1. During the aging process,
  1. muscles do not change appreciably
  2. muscle cell number stays constant but they become smaller
  3. muscle cells are lost and replaced by fat
  4. muscles actually become stronger
  5. more than one of the above is correct
  1. The muscle that closes the eye is the
  1. orbicularis oris
  2. orbicularis oculi
  3. temporalis
  4. frontalis
  5. masseter
  1. The muscle which closes the jaw is the
  1. orbicularis oris
  2. temporalis
  3. frontalis
  4. masseter
  5. buccinator
  1. The muscle which pulls the head downward is the
  1. frontalis
  2. sternocleidomastoid
  3. rectus femoris
  4. serratus anterior
  5. internal oblique
  1. The muscle which compresses the abdomen is the
  1. serratus anterior
  2. pectoralis major
  3. internal oblique
  4. deltoid
  5. sternocleidomastoid
  1. The deltoid muscle
  1. abducts the arm
  2. adducts the arm
  3. compresses the abdomen
  4. rotates the shoulder
  5. none of the above
  1. The pectoralis major
  1. compresses the chest
  2. flexes the spinal column
  3. adducts the arm
  4. compresses the abdomen
  5. extends the abdomen
  1. The triceps brachii
  1. flexes the arm
  2. rotates the arm
  3. extends the arm
  4. abducts the shoulder
  5. more than one of the above is correct
  1. The gluteus maximus
  1. flexes the thigh
  2. extends the thigh
  3. flexes the vertebral column
  4. compresses the abdomen
  5. compresses the pelvis
  1. The muscle which extends the leg is the
  1. rectus femoris
  2. biceps femoris
  3. semitendinosus
  4. semimembranosus
  5. gracilis
  1. The muscle which flexes the leg is the
  1. gracilis
  2. semimembranosus
  3. semitendinosus
  4. biceps femoris
  5. more than one of the above is correct
  1. The muscle which flexes the foot is the
  1. tibialis anterior
  2. gastrocnemius
  3. semimembranosus
  4. semitendinosus
  5. rectus femoris