Question 1

The multiple nuclei in skeletal muscle cells are the result of the

Accepted Answer

A)   fusion of myoblasts.
B)   cytokinesis of embryonic satellite cells.
C)   spontaneous development of nuclei in embryonic cells.
D)   stimulation of fibroblasts by hormones.
E)   action of testosterone on mesenchyme cell.F) B) and C)
G) A) and E)

Question 2

Energy requirements for smooth muscle contractions are generally higher than those for skeletal muscle contractions.

Accepted Answer

A) True 
 B)False

Question 3

Fibers from one motor unit

Accepted Answer

A)   are clustered together within one fascicle of the muscle.
B)   are dispersed throughout most of the muscle.C) A) and B)
D) undefined

Question 4

Each skeletal muscle is composed of ________, which are bundles of muscle fibers.

Accepted Answer

The answer of Each skeletal muscle is composed of ________,...

Question 5

The connections between the nervous system and skeletal muscle allow for voluntary control of movement.

Accepted Answer

A) True 
 B)False

Question 6

Which is not a protein found in thin filaments?

Accepted Answer

A)   Actin
B)   Troponin
C)   Tropomyosin
D)   Myosin
E)   No exceptions; all are found in thin filamentsF) None of the above
G) A) and E)

Question 7

The floor of the pelvic cavity includes skeletal muscles that function to support organs in that cavity.

Accepted Answer

A) True 
 B)False

Question 8

When tension output exceeds resistance and the muscle exerts a constant force as it changes length, the contraction is described as ________.

Accepted Answer

The answer of When tension output exceeds resistance and the...

Question 9

Which fibers dominate many of the back and calf muscles that contract almost continually to maintain posture?

Accepted Answer

A)   Slow-twitch
B)   Fast-twitch
C)   IntermediateD) None of the above
E) All of the above

Question 10

________ muscle fibers have large myoglobin stores, slow contraction velocity, and the highest resistance to fatigue.

Accepted Answer

The answer of ________ muscle fibers have large myoglobin stores,...

Question 11

The junction between an axon and the muscle fiber itself is called a ________ junction.

Accepted Answer

The answer of The junction between an axon and the...

Question 12

Muscles that are used for precisely controlled movements generally contain large motor units.

Accepted Answer

A) True 
 B)False

Question 13

When an impulse arrives at the knob of the motor neuron, calcium

Accepted Answer

A)   enters through active transport pumps and triggers the release of transmitter.
B)   enters through voltage-gated channels and triggers the release of transmitter.
C)   exits through active transport pumps and brings transmitter with it.
D)   exits through voltage-gated channels and triggers transmitter release.
E)   is released from synaptic vesicles.F) B) and E)
G) All of the above

Question 14

Lifting weights will cause muscles to enlarge. This is primarily due to

Accepted Answer

A)   an increase in the number of muscle cells.
B)   an increase in the size of muscle cells.C) A) and B)
D) undefined

Question 15

For relaxation to occur,

Accepted Answer

A)   calcium leaves the sarcoplasmic reticulum, and troponin binds calcium and blocks the binding sites on actin.
B)   calcium enters the myofibril, it detaches from myosin, and the binding sites on myosin become inactive.
C)   sarcoplasm calcium levels fall, calcium is removed from troponin, and tropomyosin blocks binding sites on actin.
D)   extracellular calcium levels fall, calcium is pumped into the myofibril, and tropomyosin slides away from actin.E) None of the above
F) A) and B)

Question 16

The ________ is the connective tissue covering of a fascicle.

Accepted Answer

The answer of The ________ is the connective tissue covering...

Question 17

When a muscle relaxes,

Accepted Answer

A)   crossbridges form and muscle extensibility returns the muscle to rest length.
B)   crossbridges form and muscle elasticity returns the muscle to rest length.
C)   crossbridges stop forming and muscle elasticity returns the muscle to rest length.
D)   crossbridges stop forming and muscle extensibility returns the muscle to rest length.E) A) and C)
F) A) and B)

Question 18

During REM sleep, muscle tone decreases significantly.

Accepted Answer

A) True 
 B)False

Question 19

Invaginations of the muscle cell membrane that extend deep into the cell are known as the

Accepted Answer

A)   T-tubules.
B)   terminal cisternae.
C)   titin complexes.
D)   Z-discs.
E)   end plates.F) B) and E)
G) C) and D)

Question 20

A drug that inhibited acetylcholinesterase would result in

Accepted Answer

A)   a failure to stimulate the muscle due to decreased ACh release.
B)   enhanced stimulation of the muscle due to decreased ACh breakdown.
C)   enhanced stimulation of the muscle due to enhanced ACh release.
D)   poor muscle stimulation due to enhanced ACh breakdown.E) A) and B)
F) None of the above

Exam 10: Muscle Tissue

A drug that inhibited acetylcholinesterase would result in

Correct AnswerverifiedShow Answer

Invaginations of the muscle cell membrane that extend deep into the cell are known as the

Correct AnswerverifiedShow Answer

Energy requirements for smooth muscle contractions are generally higher than those for skeletal muscle contractions.

Correct AnswerverifiedShow Answer

The multiple nuclei in skeletal muscle cells are the result of the

Correct AnswerverifiedShow Answer

During REM sleep, muscle tone decreases significantly.

Correct AnswerverifiedShow Answer

________ muscle fibers have large myoglobin stores, slow contraction velocity, and the highest resistance to fatigue.

Correct AnswerverifiedShow Answer

Muscles that are used for precisely controlled movements generally contain large motor units.

Correct AnswerverifiedShow Answer

Lifting weights will cause muscles to enlarge. This is primarily due to

Correct AnswerverifiedShow Answer

The ________ is the connective tissue covering of a fascicle.

Correct AnswerverifiedShow Answer

When an impulse arrives at the knob of the motor neuron, calcium

Correct AnswerverifiedShow Answer

When a muscle relaxes,

Correct AnswerverifiedShow Answer

The junction between an axon and the muscle fiber itself is called a ________ junction.

Correct AnswerverifiedShow Answer

For relaxation to occur,

Correct AnswerverifiedShow Answer

Which is not a protein found in thin filaments?

Correct AnswerverifiedShow Answer

Which fibers dominate many of the back and calf muscles that contract almost continually to maintain posture?

Correct AnswerverifiedShow Answer

The connections between the nervous system and skeletal muscle allow for voluntary control of movement.

Correct AnswerverifiedShow Answer

Each skeletal muscle is composed of ________, which are bundles of muscle fibers.

Correct AnswerverifiedShow Answer

The floor of the pelvic cavity includes skeletal muscles that function to support organs in that cavity.

Correct AnswerverifiedShow Answer

When tension output exceeds resistance and the muscle exerts a constant force as it changes length, the contraction is described as ________.

Correct AnswerverifiedShow Answer

Fibers from one motor unit

Correct AnswerverifiedShow Answer

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