Question 1

When a muscle undergoes atrophy in response to disuse,

Accepted Answer

A)   there is a reduction in capillary networks.
B)   the number of mitochondria decreases.
C)   the size of actin and myosin filaments decreases.
D)   the muscle gets smaller.
E)   All of the answer choices are correct.

Question 2

The electrical impulse that triggers a contraction travels deep into a skeletal muscle fiber by means of

Accepted Answer

A)   sarcoplasmic reticulum.
B)   transverse tubules.
C)   mitochondria.
D)   motor end plates.
E)   gap junctions.

Question 3

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

Accepted Answer

A) True 
 B)False

Question 4

A response to nervous stimulation that originates repeatedly from the spinal cord and stimulates only a few muscle fibers at a time is

Accepted Answer

A)   muscle tone.
B)   tetanus.
C)   summation.
D)   myogram.

Question 5

The gap that separates a muscle cell membrane from the neuron cell membrane in a neuromuscular junction is called the

Accepted Answer

A)   synaptic cleft.
B)   T-tubule.
C)   motor end plate.
D)   junctional synapse.
E)   neuromuscular junction.

Question 6

The muscle most responsible for a particular movement is called the prime mover or antagonist.

Accepted Answer

A) True 
 B)False

Question 7

During the aerobic respiration process,glucose is broken down into

Accepted Answer

A)   creatine phosphate.
B)   pyruvic acid.
C)   lactic acid.
D)   carbon dioxide,water and ATP.

Question 8

Muscles that assist a prime mover are called ________.

Accepted Answer

The answer of Muscles that assist a prime mover are...

Question 9

A sarcomere is best described as ________

Accepted Answer

A)   a part of the sarcoplasmic reticulum
B)   a group of fascicles
C)   a group of myofibrils
D)   a unit within a myofibril
E)   All of the choices are correct.

Question 10

In skeletal muscle cells,this abundant molecule may be used to transfer energy to ADP to form ATP.

Accepted Answer

A)   acetylcholine
B)   troponin
C)   actin
D)   creatine phosphate

Question 11

Rigor mortis that occurs in skeletal muscles a few hours after death is due to

Accepted Answer

A)   excessive ATP,and decreased membrane permeability to calcium ions.
B)   lack of ATP,and increased membrane permeability to calcium ions.
C)   persistent stimulation by motor neuron.
D)   a decrease in the number of muscle fibers.
E)   None of the choices are correct.

Question 12

After death a condition called rigor mortis develops due to a sarcoplasmic increase in calcium levels along with a decreased level of

Accepted Answer

A)   ATP.
B)   ADP.
C)   sodium.
D)   potassium.
E)   myoglobin.

Question 13

In skeletal muscle,the thick filaments are mainly composed of ___________.

Accepted Answer

A)   myosin
B)   actin
C)   myofibrils
D)   sarcoplasm
E)   Z lines

Question 14

Enlarged portions of the sarcoplasmic reticulum are called __________.

Accepted Answer

A)   synaptic clefts
B)   cisternae
C)   H-zones
D)   T-tubules
E)   motor end plates

Question 15

Compared to skeletal muscle,smooth muscle

Accepted Answer

A)   contracts more slowly and relaxes more slowly.
B)   contracts more slowly and relaxes more rapidly.
C)   contracts more rapidly and relaxes more slowly.
D)   contracts more rapidly and relaxes more rapidly.
E)   is under voluntary control.

Question 16

Smooth muscle contraction that occurs in wave-like motions to move contents along the length of tubular organs describes

Accepted Answer

A)   clonus.
B)   tetany.
C)   peristalsis.
D)   summation.
E)   threshold.

Question 17

The less movable end of a skeletal muscle attachment is called the

Accepted Answer

A)   origin.
B)   insertion.
C)   tendon.
D)   ligament.
E)   epimysium.

Question 18

In the initiation of muscle contraction,calcium ions bind to tropomyosin,exposing active sites on actin for cross-bridge formation.

Accepted Answer

A) True 
 B)False

Question 19

During the anaerobic breakdown of glucose,glucose is broken down into

Accepted Answer

A)   creatine phosphate.
B)   pyruvic acid.
C)   carbon dioxide.
D)   water and ATP.
E)   all of the above.

Question 20

The time between the moment of stimulation and the beginning of contraction is called the

Accepted Answer

A)   subthreshold stimulus.
B)   incomplete recruitment.
C)   muscle fatigue.
D)   temporal delay.
E)   latent period.

Exam 8: Muscular System

Enlarged portions of the sarcoplasmic reticulum are called __________.

Correct AnswerverifiedShow Answer

During the aerobic respiration process,glucose is broken down into

Correct AnswerverifiedShow Answer

The gap that separates a muscle cell membrane from the neuron cell membrane in a neuromuscular junction is called the

Correct AnswerverifiedShow Answer

Smooth muscle contraction that occurs in wave-like motions to move contents along the length of tubular organs describes

Correct AnswerverifiedShow Answer

The less movable end of a skeletal muscle attachment is called the

Correct AnswerverifiedShow Answer

In skeletal muscle,the thick filaments are mainly composed of ___________.

Correct AnswerverifiedShow Answer

In the initiation of muscle contraction,calcium ions bind to tropomyosin,exposing active sites on actin for cross-bridge formation.

Correct AnswerverifiedShow Answer

After death a condition called rigor mortis develops due to a sarcoplasmic increase in calcium levels along with a decreased level of

Correct AnswerverifiedShow Answer

A response to nervous stimulation that originates repeatedly from the spinal cord and stimulates only a few muscle fibers at a time is

Correct AnswerverifiedShow Answer

The muscle most responsible for a particular movement is called the prime mover or antagonist.

Correct AnswerverifiedShow Answer

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

Correct AnswerverifiedShow Answer

The electrical impulse that triggers a contraction travels deep into a skeletal muscle fiber by means of

Correct AnswerverifiedShow Answer

A sarcomere is best described as ________

Correct AnswerverifiedShow Answer

Rigor mortis that occurs in skeletal muscles a few hours after death is due to

Correct AnswerverifiedShow Answer

During the anaerobic breakdown of glucose,glucose is broken down into

Correct AnswerverifiedShow Answer

The time between the moment of stimulation and the beginning of contraction is called the

Correct AnswerverifiedShow Answer

In skeletal muscle cells,this abundant molecule may be used to transfer energy to ADP to form ATP.

Correct AnswerverifiedShow Answer

Compared to skeletal muscle,smooth muscle

Correct AnswerverifiedShow Answer

Muscles that assist a prime mover are called ________.

Correct AnswerverifiedShow Answer

When a muscle undergoes atrophy in response to disuse,

Correct AnswerverifiedShow Answer

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