Question 1

Identify the statement concerning general functional characteristics of muscle that is true.

Accepted Answer

A)  Muscle tissue shortens forcefully but lengthens passively.
B)  Muscle tissue shortens passively but lengthens forcefully.
C)  Muscle tissue can get shorter,but can not get longer.
D)  Muscle tissue can get longer,but can not get shorter.
E)  None of these statements are true.F) C) and D)
G) B) and E)

Question 2

Which of the following is part of a thin myofilament?

Accepted Answer

A)  ATP-binding site
B)  globular (G) actin
C)  calcium
D)  myosin
E)  sarcolemmaF) A) and C)
G) D) and E)

Question 3

Concentric contractions occur when

Accepted Answer

A)  the muscle produces increasing tension as it shortens.
B)  the tension and length of the muscle remain constant during a contraction.
C)  tension in a muscle is maintained while the muscle increases in length.
D)  the muscle produces tension while the length of the muscle increases.
E)  isometric contractions occur.F) All of the above
G) C) and E)

Question 4

Acetylcholine binds to a membrane bound receptor and causes ligand-gated sodium channels to open and results in

Accepted Answer

A)  hyperpolarization.
B)  depolarization.
C)  hypoplarization.
D)  no change in membrane potential.
E)  There is not enough information to predict the outcome.F) All of the above
G) B) and E)

Question 5

Which type of respiration rapidly produces ATP for short time periods?

Accepted Answer

A)  anaerobic respiration
B)  aerobic respiration
C)  both anaerobic and aerobic respirationD) None of the above
E) All of the above

Question 6

Which of the following is true during the resting membrane potential?

Accepted Answer

A)  Sodium ion concentration is greater inside cells.
B)  Negatively charged proteins are more concentrated outside the cell.
C)  A greater concentration of calcium ions is found inside the cell.
D)  Potassium is concentrated primarily inside the cell.
E)  None of these choices reflect what occurs during the resting membrane potential.F) B) and E)
G) A) and E)

Question 7

Cardiac muscle cells are like skeletal muscle cells in that they both

Accepted Answer

A)  have striations.
B)  depolarize as a result of sodium and calcium influxes.
C)  possess intercalated disks.
D)  lack sarcomeres.
E)  are multinucleated.F) A) and D)
G) B) and D)

Question 8

A lack of mitochondria within skeletal muscle would impair which ATP-yielding chemical process?

Accepted Answer

A)  anaerobic respiration
B)  aerobic respiration
C)  both anaerobic and aerobic respirationD) A) and B)
E) A) and C)

Question 9

-What does "A" represent on the diagram?

Accepted Answer

A)  myosin myofilament
B)  actin myofilament
C)  sarcomere
D)  Z disk
E)  cross-bridgeF) A) and E)
G) None of the above

Question 10

An action potential

Accepted Answer

A)  occurs when the local potential reaches threshold level.
B)  is not propagated.
C)  has no repolarization phase.
D)  is an example of negative feedback.
E)  can be of varying strengths depending on strength of the stimulus.F) A) and C)
G) A) and B)

Question 11

Anabolic steroids can do all of the following except

Accepted Answer

A)  increase muscle size and strength.
B)  cause testicular atrophy.
C)  cause cardiovascular disease.
D)  increase the number of muscle fibers.
E)  increase total muscle mass.F) A) and D)
G) C) and D)

Question 12

T tubules are invaginations of the

Accepted Answer

A)  sarcoplasmic reticulum.
B)  sarcomere.
C)  myofibril.
D)  sarcoplasm.
E)  sarcolemma.F) A) and D)
G) B) and E)

Question 13

A myofilament is the

Accepted Answer

A)  cell membrane of a muscle fiber.
B)  cytoplasm of muscle cells.
C)  structural and functional unit of the skeletal muscle cell.
D)  contractile thread that extends the length of the muscle fiber.
E)  protein strand composed of actin or myosin.F) None of the above
G) C) and D)

Question 14

A cancer patient is told by their physician that their colon is lacking smooth muscle tone.What does this mean?

Accepted Answer

A)   The colon is developing action potentials too rapidly.
B)   The colon has too many shallow invaginations of cell membranes.
C)   The colon is unable to maintain constant tension for sustained periods of time.
D)   The intracellular cytoskeleton is overactive.E) C) and D)
F) B) and D)

Question 15

Which of the following is NOT true of muscular atrophy?

Accepted Answer

A)  It is irreversible.
B)  It can be caused by disuse.
C)  It can be caused by denervation.
D)  Transcutaneous stimulation can help prevent it.
E)  Muscle fibers are replaced by connective tissue.F) A) and B)
G) A) and C)

Question 16

One ATP molecule is required for

Accepted Answer

A)  formation of the cross-bridge.
B)  movement of the cross-bridge.
C)  release of the cross-bridge.
D)  formation of the cross-bridge and for movement of the cross-bridge.
E)  formation of the cross-bridge,for movement of the cross-bridge,and for release of the cross-bridge.F) A) and E)
G) A) and C)

Question 17

One cause of spastic paralysis might be

Accepted Answer

A)  inhibition of acetylcholine molecules.
B)  blockage of acetylcholine receptors.
C)  inhibition of acetylcholinesterase.
D)  destruction of synaptic vesicles.
E)  increase in the amount of acetylcholinesterase.F) A) and D)
G) B) and E)

Question 18

In a laboratory experiment,the resting membrane potential of a muscle is measured and is found to be more negative.Which of the following has occurred?

Accepted Answer

A)  hyperpolarization
B)  repolarization
C)  depolarization
D)  isopolarization
E)  hypopolarizationF) B) and E)
G) None of the above

Question 19

Which of the following correctly describes myoglobin's special function in muscle tissue?

Accepted Answer

A)  breaks down glycogen
B)  synthesizes ATP
C)  acts as a reservoir for oxygen
D)  produces action potentials
E)  stores glucoseF) B) and C)
G) None of the above

Question 20

Endomysium is a delicate network of loose connective tissue that

Accepted Answer

A)  surrounds each muscle fiber.
B)  forms a sheath around a fasciculus.
C)  is composed of elastic fibers.
D)  separates individual muscles.
E)  penetrates muscle fibers.F) B) and E)
G) A) and B)

Exam 9: Muscular System: Histology and Physiology

Which of the following is NOT true of muscular atrophy?

Correct AnswerverifiedShow Answer

Identify the statement concerning general functional characteristics of muscle that is true.

Correct AnswerverifiedShow Answer

Cardiac muscle cells are like skeletal muscle cells in that they both

Correct AnswerverifiedShow Answer

Concentric contractions occur when

Correct AnswerverifiedShow Answer

A myofilament is the

Correct AnswerverifiedShow Answer

Which type of respiration rapidly produces ATP for short time periods?

Correct AnswerverifiedShow Answer

Endomysium is a delicate network of loose connective tissue that

Correct AnswerverifiedShow Answer

Which of the following is part of a thin myofilament?

Correct AnswerverifiedShow Answer

Anabolic steroids can do all of the following except

Correct AnswerverifiedShow Answer

Which of the following is true during the resting membrane potential?

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An action potential

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A cancer patient is told by their physician that their colon is lacking smooth muscle tone.What does this mean?

Correct AnswerverifiedShow Answer

Which of the following correctly describes myoglobin's special function in muscle tissue?

Correct AnswerverifiedShow Answer

A lack of mitochondria within skeletal muscle would impair which ATP-yielding chemical process?

Correct AnswerverifiedShow Answer

-What does "A" represent on the diagram?

Correct AnswerverifiedShow Answer

In a laboratory experiment,the resting membrane potential of a muscle is measured and is found to be more negative.Which of the following has occurred?

Correct AnswerverifiedShow Answer

One cause of spastic paralysis might be

Correct AnswerverifiedShow Answer

One ATP molecule is required for

Correct AnswerverifiedShow Answer

Acetylcholine binds to a membrane bound receptor and causes ligand-gated sodium channels to open and results in

Correct AnswerverifiedShow Answer

T tubules are invaginations of the

Correct AnswerverifiedShow Answer

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