Question 1

"Pull-ups" are easier to do with the hands supinated than with the hands pronated.An explanation for this is

Accepted Answer

A)  the biceps brachii is attached to the radial tuberosity.
B)  the biceps brachii supinates the forearm.
C)  if the forearm is pronated,the biceps brachii is ineffective in flexing the forearm.
D)  the brachialis is a much smaller muscle than the biceps brachii.
E)  All of these contribute to a full and proper explanation.F) D) and E)
G) A) and C)

Question 2

The ________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___________.

Accepted Answer

A)  muscle fiber,receiving a stimulus
B)  muscle fiber,contracting
C)  sarcomere,contracting
D)  sarcomere,receiving a stimulus
E)  myofibril,contractingF) A) and D)
G) A) and C)

Question 3

Extensibility is the ability of skeletal muscle to

Accepted Answer

A)  shorten with force.
B)  respond to a stimulus.
C)  recoil to their original resting length.
D)  be stretched.
E)  create heat energy through contraction.F) C) and E)
G) A) and D)

Question 4

Muscle myofibrils

Accepted Answer

A)  contain actin and myosin myofilaments.
B)  extend from one end of the muscle fiber to the other.
C)  contain sarcomeres joined end to end.
D)  have all of these properties.
E)  contain actin and myosin myofilaments and extend from one end of the muscle fiber to the other.F) D) and E)
G) B) and D)

Question 5

Given these events: 1) calcium ions move along their concentration gradient
2) action potential in cell membrane
3) opening of ion channels in sarcoplasmic reticulum
4) action potential in T tubules
5) actin to myosin cross-bridges form
Arrange them in the correct sequence as they participate during skeletal muscle contraction.

Accepted Answer

A)  1,2,5,3,4
B)  1,5,4,3,2
C)  2,4,3,1,5
D)  2,1,5,3,4
E)  5,3,4,2,1F) None of the above
G) A) and B)

Question 6

The major abductor of the upper limb is the

Accepted Answer

A)  trapezius.
B)  latissimus dorsi.
C)  deltoid.
D)  pectoralis major.
E)  biceps brachii.F) C) and D)
G) B) and E)

Question 7

Most types of nerve gas exert their effect by inactivating acetylcholinesterase.One of the antidotes for nerve gas is atropine,which is also a poison.Although it may seem strange to have one poison counteract the effects of another poison,which of the following suggestions might be accurate for the effect that atropine has on the neuromuscular junction?

Accepted Answer

A)  Atropine increases the production of acetylcholine in the synaptic vesicles.
B)  Atropine increases the release of acetylcholine across the synaptic cleft.
C)  Atropine increases the number of receptor sites for acetylcholine on the muscle cell membrane.
D)  Atropine attaches to receptor sites for acetylcholine on the muscle cell membrane.
E)  Atropine increases both the release of acetylcholine and the number of available receptor sites.F) C) and E)
G) A) and C)

Question 8

Which of the following muscles are used to elevate the larynx?

Accepted Answer

A)  the masseter
B)  the soft palate muscles
C)  the hyoid muscles
D)  the pharyngeal constrictors
E)  the sternocleidomastoidF) A) and E)
G) A) and D)

Question 9

Muscle fibers

Accepted Answer

A)  have a relatively high metabolic rate
B)  depend upon large amounts of O2
C)  contain large numbers of mitochondria
D)  preferentially use aerobic respiration
E)  all of the above are true of muscle fibersF) B) and E)
G) B) and D)

Question 10

Which of these muscles is NOT a fixator of the scapula?

Accepted Answer

A)  latissimus dorsi
B)  trapezius
C)  levator scapulae
D)  serratus anterior
E)  pectoralis minorF) B) and E)
G) A) and B)

Question 11

Carl Daver,your anatomy and physiology instructor,is conducting a field trip,and notices a dog approaching a fire hydrant Always alert to instructional opportunities,he excitedly says,"Now watch as the dog utilizes his _____ and _____ muscles to lift his leg."

Accepted Answer

A)  iliopsoas,gluteus medius
B)  gluteus maximus,tensor fascia latae
C)  gluteus maximus,adductor longus
D)  iliopsoas,quadriceps femoris
E)  gluteus medius,adductor longusF) A) and D)
G) None of the above

Question 12

A high-energy molecule that can be quickly used to produce ATP is

Accepted Answer

A)  creatine phosphate.
B)  glucose.
C)  carbon dioxide.
D)  lactic acid.
E)  water.F) None of the above
G) D) and E)

Question 13

What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

Accepted Answer

A)  the amount of calcium that enters the pre-synaptic cell
B)  the rate of diffusion of acetylcholine across the synaptic cleft
C)  the number of muscle fibers that make up the motor unit
D)  enzymatic breakdown of acetylcholine by acetylcholinesterase
E)  All of these ensure this one to one ratio.F) None of the above
G) C) and D)

Question 14

A muscle fiber will not respond to a stimulus until that stimulus reaches the

Accepted Answer

A)  tetany.
B)  relaxation level.
C)  rigor mortis level.
D)  threshold level.
E)  recruitment level.F) A) and D)
G) All of the above

Question 15

ATP

Accepted Answer

A)  attaches to the myosin myofilaments.
B)  provides energy for the movement of the cross bridges.
C)  is required for muscle relaxation.
D)  releases part of its energy as heat.
E)  has all of these characteristics.F) A) and B)
G) A) and C)

Question 16

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.

Accepted Answer

A)  Z disks
B)  A band
C)  M line
D)  I band
E)  H zoneF) C) and D)
G) A) and D)

Question 17

Curare is a poison used by South American Indians.It is known to bind to ACh receptors preventing the binding of ACh.What effect would it have on muscle function?

Accepted Answer

A)  The muscle fibers would contract uncontrollably and continually.
B)  The muscle fibers would not contract because the Na+ channels which cause depolarization of the muscle fiber membrane are never signaled to open.
C)  The pre-synaptic release of ACh would be inhibited,therefore the muscle would not contract.
D)  The action of acetylcholinesterase would be inhibited causing increased contraction.
E)  Both the muscle fibers would contract uncontrollably and continually and the action of acetylcholinesterase would be inhibited causing increased contraction would occur.F) B) and E)
G) All of the above

Question 18

-The letter A in this figure represents

Accepted Answer

A)  the A band.
B)  the M line.
C)  a sarcomere.
D)  the I band.
E)  a Z disk.F) C) and D)
G) A) and D)

Question 19

What are the relative concentrations of Na+,K+ and dissolved proteins in the intracellular solution (i.e.cytosol) as opposed to in the extracellular fluid?

Accepted Answer

A)   ↑\uparrow↑  Na+, ↑\uparrow↑  K+,and  ↑\uparrow↑  dissolved proteins inside the cell
B)   ↑\uparrow↑  Na+, ↓\downarrow↓  K+,and  ↑\uparrow↑  dissolved proteins inside the cell
C)   ↓\downarrow↓  Na+, ↑\uparrow↑  K+,and  ↑\uparrow↑ dissolved proteins inside the cell
D)   ↓\downarrow↓  Na+, ↓\downarrow↓  K+,and  ↓\downarrow↓  dissolved proteins inside the cell E) B) and C)
F) A) and D)

Question 20

Organophospahtes cause spastic paralysis because:

Accepted Answer

A)  their action produces a constant stimulus to contract
B)  they inhibit the activity of acetylcholinesterase
C)  they prevent the degradation of acetylcholine in the neuromuscular junction
D)  they prevent the muscles from relaxing
E)  all of the above are trueF) C) and E)
G) A) and E)

Exam 7: Muscular System

A muscle fiber will not respond to a stimulus until that stimulus reaches the

Correct Answer
verified

Organophospahtes cause spastic paralysis because:

Correct Answer
verified

The is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___.

Correct Answer
verified

Correct Answer
verified

What are the relative concentrations of Na⁺,K⁺ and dissolved proteins in the intracellular solution (i.e.cytosol) as opposed to in the extracellular fluid?

Correct Answer
verified

"Pull-ups" are easier to do with the hands supinated than with the hands pronated.An explanation for this is

Correct Answer
verified

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.

Correct Answer
verified

What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

Correct Answer
verified

-The letter A in this figure represents

Correct Answer
verified

Extensibility is the ability of skeletal muscle to

Correct Answer
verified

Which of the following muscles are used to elevate the larynx?

Correct Answer
verified

Muscle myofibrils

Correct Answer
verified

Carl Daver,your anatomy and physiology instructor,is conducting a field trip,and notices a dog approaching a fire hydrant Always alert to instructional opportunities,he excitedly says,"Now watch as the dog utilizes his _ and _ muscles to lift his leg."

Correct Answer
verified

Curare is a poison used by South American Indians.It is known to bind to ACh receptors preventing the binding of ACh.What effect would it have on muscle function?

Correct Answer
verified

Which of these muscles is NOT a fixator of the scapula?

Correct Answer
verified

Muscle fibers

Correct Answer
verified

The major abductor of the upper limb is the

Correct Answer
verified

A high-energy molecule that can be quickly used to produce ATP is

Correct Answer
verified

Correct Answer
verified

ATP

Correct Answer
verified

Exam 7: Muscular System

A muscle fiber will not respond to a stimulus until that stimulus reaches the

Correct AnswerverifiedShow Answer

Organophospahtes cause spastic paralysis because:

Correct AnswerverifiedShow Answer

The ________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What are the relative concentrations of Na+,K+ and dissolved proteins in the intracellular solution (i.e.cytosol) as opposed to in the extracellular fluid?

Correct AnswerverifiedShow Answer

"Pull-ups" are easier to do with the hands supinated than with the hands pronated.An explanation for this is

Correct AnswerverifiedShow Answer

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.

Correct AnswerverifiedShow Answer

What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

Correct AnswerverifiedShow Answer

-The letter A in this figure represents

Correct AnswerverifiedShow Answer

Extensibility is the ability of skeletal muscle to

Correct AnswerverifiedShow Answer

Which of the following muscles are used to elevate the larynx?

Correct AnswerverifiedShow Answer

Muscle myofibrils

Correct AnswerverifiedShow Answer

Carl Daver,your anatomy and physiology instructor,is conducting a field trip,and notices a dog approaching a fire hydrant Always alert to instructional opportunities,he excitedly says,"Now watch as the dog utilizes his _____ and _____ muscles to lift his leg."

Correct AnswerverifiedShow Answer

Curare is a poison used by South American Indians.It is known to bind to ACh receptors preventing the binding of ACh.What effect would it have on muscle function?

Correct AnswerverifiedShow Answer

Which of these muscles is NOT a fixator of the scapula?

Correct AnswerverifiedShow Answer

Muscle fibers

Correct AnswerverifiedShow Answer

The major abductor of the upper limb is the

Correct AnswerverifiedShow Answer

A high-energy molecule that can be quickly used to produce ATP is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

ATP

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

The is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___.

Correct Answer
verified

Correct Answer
verified

What are the relative concentrations of Na⁺,K⁺ and dissolved proteins in the intracellular solution (i.e.cytosol) as opposed to in the extracellular fluid?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Carl Daver,your anatomy and physiology instructor,is conducting a field trip,and notices a dog approaching a fire hydrant Always alert to instructional opportunities,he excitedly says,"Now watch as the dog utilizes his _ and _ muscles to lift his leg."

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified