Question 1

After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?

Accepted Answer

A)   acetylcholinesterase breaks apart the ACh
B)   the action potential stops going down the overloaded T tubules
C)   calcium ions returning to the terminal cisternae
D)   the tropomyosin blocking the myosin once full contraction is achieved

Question 2

How is it that norepinephrine (NE) can inhibit smooth muscle action in airways, yet stimulate contractions in smooth muscles everywhere else in the body?

Accepted Answer

Norepinephrine's effects depen...

Question 3

The contractile units of skeletal muscles are_________ .

Accepted Answer

A)   myofibrils
B)   mitochondria
C)   microtubules
D)   T tubules

Question 4

A 5-year-old male is diagnosed with Duchenne muscular dystrophy (DMD). Discuss what this means in terms of the boy's muscles and what should his parents expect to observe.

Accepted Answer

Duchenne muscular dystrophy is a muscle ...

Question 5

What is the primary function of wave summation?

Accepted Answer

A)   prevent muscle relaxation
B)   prevent muscle fatigue
C)   produce smooth, continuous muscle contraction
D)   increase muscle tension

Question 6

Which of the following statements is true?

Accepted Answer

A)   Cardiac muscle cells are found in the heart and large blood vessels.
B)   Cardiac muscle cells have many nuclei.
C)   Striated muscle cells are long and cylindrical with many nuclei.
D)   Smooth muscle cells have T tubules.

Question 7

Which of the following is true about smooth muscle?

Accepted Answer

A)   Smooth muscle has well-developed T tubules at the site of invagination.
B)   Certain smooth muscle cells can actually divide to increase their numbers.
C)   Smooth muscle cannot stretch as much as skeletal muscle.
D)   Smooth muscle, in contrast to skeletal muscle, cannot synthesize or secrete any connective tissue elements.

Question 8

Peristalsis is characteristic of smooth muscle.

Accepted Answer

A) True 
 B)False

Question 9

The end of the muscle that is attached to the part of the body in motion when a muscle contracts is called the__________.

Accepted Answer

The answer of The end of the muscle that is...

Question 10

Only__________ muscle cells are multinucleated.

Accepted Answer

The answer of Only__________ muscle cells are multinucleated....

Question 11

Which of the following is a factor that affects the velocity and duration of muscle contraction?

Accepted Answer

A)   size of the muscle fibers stimulated
B)   muscle length
C)   load on the fiber
D)   number of muscle fibers stimulated

Question 12

Only __________muscle cells have intercalated discs at their gap junctions.

Accepted Answer

The answer of Only __________muscle cells have intercalated discs at...

Question 13

Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments.

Accepted Answer

A) True 
 B)False

Question 14

Caveolae are an anatomical feature of smooth muscle. Describe this anatomical feature and specifically how it improves smooth muscles' response to nervous stimulation

Accepted Answer

Caveolae are pouch like inhold...

Question 15

A skeletal muscle contracts with varying force and length of time in response to the body's needs at the time.

Accepted Answer

A) True 
 B)False

Question 16

During isometric contraction, the energy used appears as movement.

Accepted Answer

A) True 
 B)False

Question 17

A potential benefit of recruiting slow oxidative fibers for contraction before recruiting fast oxidative and fast glycolytic fibers might be __________.

Accepted Answer

A)   to allow for fine control with delicate contractile force with a small stimulus
B)   recruiting slow oxidative fibers early helps to tire them out first so that they won't interfere with the more powerful contractions of fast glycolytic fibers
C)   because they are slower to respond, slow oxidative fibers must be stimulated first in order to contract simultaneously with the faster fibers
D)   There is little to no benefit from recruiting slow oxidative fibers first, and therefore it is in fact fast glycolytic fibers that will be recruited first.

Question 18

What does excess postexercise oxygen consumption represent?

Accepted Answer

A)   the amount of oxygen taken into the body immediately after the exertion
B)   amount of oxygen needed for aerobic activity to accomplish the same amount of work
C)   the amount of oxygen equal to the oxygen already used
D)   the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used

Question 19

Which of the following describes the cells of unitary smooth muscle?

Accepted Answer

A)   They consist of muscle fibers that are structurally independent of each other.
B)   They exhibit spontaneous action potentials.
C)   They depend upon recruitment using the autonomic nervous system.
D)   They are used for vision and hair raising.

Question 20

When a geriatric patient is admitted to the postsurgical unit, an important nursing measure is to prevent the loss of muscle mass. What is the term used for loss of muscle mass and how can the patient prevent it?

Accepted Answer

Disuse atrophy is degeneration and loss ...

Exam 9: Muscles and Muscle Tissue

How is it that norepinephrine (NE) can inhibit smooth muscle action in airways, yet stimulate contractions in smooth muscles everywhere else in the body?

Correct AnswerverifiedNorepinephrine's effects depen...View AnswerShow Answer

What is the primary function of wave summation?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following describes the cells of unitary smooth muscle?

Correct AnswerverifiedShow Answer

A skeletal muscle contracts with varying force and length of time in response to the body's needs at the time.

Correct AnswerverifiedShow Answer

The contractile units of skeletal muscles are_________ .

Correct AnswerverifiedShow Answer

What does excess postexercise oxygen consumption represent?

Correct AnswerverifiedShow Answer

Which of the following is true about smooth muscle?

Correct AnswerverifiedShow Answer

When a geriatric patient is admitted to the postsurgical unit, an important nursing measure is to prevent the loss of muscle mass. What is the term used for loss of muscle mass and how can the patient prevent it?

Correct AnswerverifiedDisuse atrophy is degeneration and loss ...View AnswerShow Answer

The end of the muscle that is attached to the part of the body in motion when a muscle contracts is called the__________.

Correct AnswerverifiedShow Answer

Only __________muscle cells have intercalated discs at their gap junctions.

Correct AnswerverifiedShow Answer

After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?

Correct AnswerverifiedShow Answer

Peristalsis is characteristic of smooth muscle.

Correct AnswerverifiedShow Answer

Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments.

Correct AnswerverifiedShow Answer

A potential benefit of recruiting slow oxidative fibers for contraction before recruiting fast oxidative and fast glycolytic fibers might be __________.

Correct AnswerverifiedShow Answer

Caveolae are an anatomical feature of smooth muscle. Describe this anatomical feature and specifically how it improves smooth muscles' response to nervous stimulation

Correct AnswerverifiedCaveolae are pouch like inhold...View AnswerShow Answer

Only__________ muscle cells are multinucleated.

Correct AnswerverifiedShow Answer

Which of the following is a factor that affects the velocity and duration of muscle contraction?

Correct AnswerverifiedShow Answer

During isometric contraction, the energy used appears as movement.

Correct AnswerverifiedShow Answer

A 5-year-old male is diagnosed with Duchenne muscular dystrophy (DMD). Discuss what this means in terms of the boy's muscles and what should his parents expect to observe.

Correct AnswerverifiedDuchenne muscular dystrophy is a muscle ...View AnswerShow Answer

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Norepinephrine's effects depen...
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Disuse atrophy is degeneration and loss ...
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Caveolae are pouch like inhold...
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Duchenne muscular dystrophy is a muscle ...
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