Question 1

Hypertrophy is

Accepted Answer

A)   an increase in the size of muscle fibers.
B)   a decrease in the size of muscle fibers.
C)   an increase in the number of muscle fibers.
D)   a decrease in the number of muscle fibers.
E)   a loss in size and strength of muscle fibers.F) B) and E)
G) None of the above

Question 2

This consists of a somatic motor neuron plus all the skeletal muscle fibers it stimulates.

Accepted Answer

A)   sarcomere
B)   motor unit
C)   neuromuscular junction
D)   somatic motor neuron
E)   muscle fiberF) B) and D)
G) C) and E)

Question 3

This is also referred to as the period of lost excitability.

Accepted Answer

A)   refractory period
B)   contraction period
C)   latent period
D)   relaxation period
E)   wave summationF) C) and E)
G) A) and E)

Question 4

Which of the following is NOT a correct structure and tissue type pairing?

Accepted Answer

A)   endomysium : loose areolar connective tissue
B)   perimysium : dense irregular connective tissue
C)   tendon : dense regular connective tissue
D)   sarcolemma : loose areolar connective tissue
E)   epimysium: dense irregular connective tissueF) C) and D)
G) B) and C)

Question 5

Calcium ions bind to the ___ molecule in skeletal muscle cells.

Accepted Answer

A)   actin
B)   troponin
C)   tropomyosin
D)   myosin
E)   titinF) B) and D)
G) B) and E)

Question 6

How many molecules of acetylcholine need to bind to open the ion channel of the ACh receptor?

Accepted Answer

A)   34
B)   5
C)   10
D)   an unknown amount
E)   2F) D) and E)
G) C) and E)

Question 7

Which structure on this diagram allows free movement of muscles, carries nerves, blood vessels and lymphatic vessels and fills spaces between whole muscles.

Accepted Answer

A)   A
B)   B
C)   E
D)   G
E)   HF) C) and D)
G) B) and C)

Question 8

These are the contractile organelles of the muscle fiber.

Accepted Answer

A)   myofibrils
B)   myoglobin
C)   mitochondria
D)   Z disc
E)   M lineF) C) and D)
G) B) and C)

Question 9

In the diagram, where is the muscle fiber located?

Accepted Answer

A)   E
B)   F
C)   G
D)   B
E)   IF) B) and E)
G) All of the above B

Question 10

The signal to excite a muscle cell must cross the neuromuscular junction by the diffusion of acetylcholine across the

Accepted Answer

A)   motor neuron axon.
B)   synaptic cleft.
C)   sarcolemma.
D)   synaptic vesicles.
E)   myofibril.F) A) and D)
G) C) and D)

Question 11

A single, brief contraction of all muscle fibers in a motor unit in response to a single action potential is called:

Accepted Answer

A)   recovery oxygen uptake
B)   motor unit movement
C)   muscle fatigue
D)   refractory period
E)   twitch contractionF) B) and D)
G) B) and E)

Question 12

What is occurring during this period of a muscle twitch contraction? 2+ in the sarcoplasm decreases, because it is being actively transported back into the sarcoplasmic reticulum and bound to calsequestrin. D)  The muscle fiber relaxes as myosin heads detach from the actin filaments. E)  Acetylcholinesterase is preventing the ligand gated channels at the motor end plate from binding to ACh." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   The muscle action potential sweeps along the sarcolemma and calcium ions are released from the sarcoplasmic reticulum.
B)   Crossbridge attachments form, and repetitive power strokes occur.
C)   The level of Ca2+ in the sarcoplasm decreases, because it is being actively transported back into the sarcoplasmic reticulum and bound to calsequestrin.
D)   The muscle fiber relaxes as myosin heads detach from the actin filaments.
E)   Acetylcholinesterase is preventing the ligand gated channels at the motor end plate from binding to ACh.F) B) and E)
G) C) and D) A

Question 13

Myofibrils contain

Accepted Answer

A)   contractile proteins.
B)   regulatory proteins.
C)   structural proteins.
D)   all of these choices.
E)   none of these choices.F) D) and E)
G) A) and B)

Question 14

In the diagram, what letter indicates a triad?

Accepted Answer

A)   G
B)   E
C)   D
D)   F
E)   CF) All of the above
G) A) and C)

Question 15

After the fusion of myoblasts, the muscle fiber loses its ability to do what?

Accepted Answer

A)   grow
B)   lengthen
C)   contract
D)   go through mitosis
E)   all of these choicesF) B) and C)
G) B) and D) D

Question 16

For every nerve that penetrates a skeletal muscle, there are in general how many arteries and veins?

Accepted Answer

A)   one artery and one or two veins
B)   two arteries and two veins
C)   three arteries and two veins
D)   one artery and three veins
E)   one artery and a varied amount of veinsF) A) and E)
G) D) and E)

Question 17

In the diagram, where is the skeletal muscle fiber?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) A) and B)
G) D) and E)

Question 18

In the diagram, what is made from dense regular connective tissue?

Accepted Answer

A)   A
B)   H
C)   C
D)   D
E)   All of these choicesF) B) and E)
G) A) and D)

Question 19

The different types of muscle tissue differ from each other by:

Accepted Answer

A)   microscopic anatomy
B)   location
C)   type of control
D)   both microscopic anatomy and location
E)   all of these choicesF) B) and C)
G) C) and D)

Question 20

During isotonic contraction, the heavier the load, the faster the velocity of muscle shortening.

Accepted Answer

A) True 
 B)False

Exam 10: Muscle Tissue

Hypertrophy is

Correct AnswerverifiedShow Answer

This consists of a somatic motor neuron plus all the skeletal muscle fibers it stimulates.

Correct AnswerverifiedShow Answer

This is also referred to as the period of lost excitability.

Correct AnswerverifiedShow Answer

Which of the following is NOT a correct structure and tissue type pairing?

Correct AnswerverifiedShow Answer

Calcium ions bind to the ___ molecule in skeletal muscle cells.

Correct AnswerverifiedShow Answer

How many molecules of acetylcholine need to bind to open the ion channel of the ACh receptor?

Correct AnswerverifiedShow Answer

Which structure on this diagram allows free movement of muscles, carries nerves, blood vessels and lymphatic vessels and fills spaces between whole muscles.

Correct AnswerverifiedShow Answer

These are the contractile organelles of the muscle fiber.

Correct AnswerverifiedShow Answer

In the diagram, where is the muscle fiber located?

Correct AnswerverifiedB

The signal to excite a muscle cell must cross the neuromuscular junction by the diffusion of acetylcholine across the

Correct AnswerverifiedShow Answer

A single, brief contraction of all muscle fibers in a motor unit in response to a single action potential is called:

Correct AnswerverifiedShow Answer

What is occurring during this period of a muscle twitch contraction?

Correct AnswerverifiedA

Myofibrils contain

Correct AnswerverifiedShow Answer

In the diagram, what letter indicates a triad?

Correct AnswerverifiedShow Answer

After the fusion of myoblasts, the muscle fiber loses its ability to do what?

Correct AnswerverifiedD

For every nerve that penetrates a skeletal muscle, there are in general how many arteries and veins?

Correct AnswerverifiedShow Answer

In the diagram, where is the skeletal muscle fiber?

Correct AnswerverifiedShow Answer

In the diagram, what is made from dense regular connective tissue?

Correct AnswerverifiedShow Answer

The different types of muscle tissue differ from each other by:

Correct AnswerverifiedShow Answer

During isotonic contraction, the heavier the load, the faster the velocity of muscle shortening.

Correct AnswerverifiedShow Answer

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B

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A

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D

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