Question 1

Which of the following changes have the potential to dramatically affect the potential difference across the plasma membrane?

Accepted Answer

A)   increased permeability of the membrane to sodium ions
B)   increased intracellular concentration of potassium ions
C)   any change in the rate at which the sodium-potassium pump works
D)   increased permeability of the membrane to sodium ions and increased intracellular concentration of potassium ions
E)   increased permeability of the membrane to sodium ions, increased intracellular concentration of potassium ions and any change in the rate at which the sodium-potassium pump worksF) A) and E)
G) A) and C)

Question 2

Which of the following structures contains the other four items listed?

Accepted Answer

A)   postsynaptic membrane
B)   presynaptic terminal
C)   synaptic cleft
D)   neuromuscular junction
E)   receptors on postsynaptic membraneF) C) and E)
G) B) and D)

Question 3

The time between application of the stimulus to a motor neuron and the beginning of contraction is called the _____ phase.

Accepted Answer

A)   contraction
B)   relaxation
C)   latent or lag
D)   refractory
E)   thresholdF) A) and D)
G) C) and D)

Question 4

Which type of muscle tissue is multinucleated?

Accepted Answer

A)   skeletal muscle
B)   smooth muscle
C)   cardiac muscle
D)   both skeletal and cardiac muscle
E)   both cardiac and smooth muscleF) B) and E)
G) A) and D)

Question 5

Curare blocks acetylcholine receptors at the motor end plate. This would result in

Accepted Answer

A)   increased stimulation of the muscle.
B)   more acetylcholinesterase production.
C)   lack of calcium uptake by the muscle fiber.
D)   inability of the muscle fiber to respond to nervous stimulation.
E)   sustained contraction of the muscle.F) B) and D)
G) None of the above

Question 6

Aerobic respiration

Accepted Answer

A)   produces ATP molecules faster than anaerobic respiration.
B)   yields as many as 36 ATP per glucose molecule metabolized.
C)   occurs whether oxygen is present or not.
D)   occurs entirely in the cytoplasm.
E)   occurs in the ribosomes.F) A) and C)
G) C) and E)

Question 7

ATPase is found in

Accepted Answer

A)   F-actin strands.
B)   G-actin globular units.
C)   myosin heads.
D)   tropomyosin grooves.
E)   troponin molecules.F) B) and C)
G) A) and E)

Question 8

Which type of muscle tissue causes contraction of the heart?

Accepted Answer

A)   skeletal muscle
B)   smooth muscle
C)   cardiac muscleD) All of the above
E) A) and C)

Question 9

Which of the following statements regarding the sliding filament model is false?

Accepted Answer

A)   Actin and myosin do not shorten during contraction.
B)   Both actin and myosin myofilaments shorten during contraction.
C)   The sarcomere shortens.
D)   The I band and H zones become narrower during contraction.
E)   The A band remains constant in length.F) A) and E)
G) B) and C)

Question 10

What type of muscle tissue has neuromuscular junctions?

Accepted Answer

A)   skeletal muscle
B)   smooth muscle
C)   cardiac muscleD) None of the above
E) All of the above

Question 11

Which of the following occurs during recovery from oxygen deficit?

Accepted Answer

A)   an elevated level of anaerobic metabolism
B)   depletion of reserves of creatine phosphate
C)   conversion of excess lactic acid to glucose
D)   glycogen degradation to provide creatine
E)   depressed level of aerobic respirationF) A) and B)
G) None of the above

Question 12

As muscle activity increases, the body temperature _____.

Accepted Answer

A)   decreases
B)   increaseC) A) and B)
D) undefined

Question 13

Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?

Accepted Answer

A)   Susan's metabolic rate was raised and it initiated sweating.
B)   Susan was more cold than usual because her inactivity prevented her muscles from helping to regulate her body temperature.
C)   Susan's uninjured muscles overcompensate for the inactive ones by contracting spontaneously.D) All of the above
E) B) and C)

Question 14

The elevated oxygen consumption relative to activity level after exercise has ended is called

Accepted Answer

A)   oxygen deficit.
B)   oxygen debt.
C)   oxygen repayment.
D)   recovery oxygen consumption.
E)   anaerobic recovery.F) A) and D)
G) A) and E)

Question 15

Betsy took a fall, broke her arm, and when she took the cast off she was alarmed to see that her muscles

Accepted Answer

A)   looked the same as they did before the fall.
B)   had undergone atrophy.
C)   undergone hypertrophy.
D)   seemed to have an increase in blood flow.E) A) and B)
F) A) and C)

Question 16

During resting conditions, _________ is synthesized to store energy?

Accepted Answer

A)   calcium
B)   creatine phosphate
C)   creatine
D)   lactic acid
E)   pyruvic acidF) A) and E)
G) C) and E)

Question 17

The stretch of elastic components of a muscle adds to the increased tension during

Accepted Answer

A)   incomplete tetanus.
B)   twitch.
C)   multiple wave summation.
D)   all or none response.
E)   none of these.F) A) and D)
G) B) and E)

Question 18

Which of the following is NOT a property of the myosin head?

Accepted Answer

A)   They form cross-bridges with the active sites of actin.
B)   They have a hinge region to bend and straighten.
C)   They bind to troponin.
D)   They have ATPase activity.
E)   They bind to ATP.F) All of the above
G) A) and C)

Question 19

Intense exercise that results in a great deal of anaerobic activity

Accepted Answer

A)   converts some slow-twitch fibers into fast-twitch fibers.
B)   increases muscular strength and mass.
C)   enlarges slow-twitch fibers.
D)   decreases the efficiency of fast-twitch fibers.
E)   decreases muscle strength and mass.F) B) and D)
G) None of the above

Question 20

Describe the H zone of the sarcomere. The H zone:

Accepted Answer

A)   contains both myosin and actin myofilaments
B)   contains only actin myofilaments
C)   contains only myosin myofilamentsD) All of the above
E) B) and C)

Exam 9: Muscular System: Histology and Physiology

Which of the following is NOT a property of the myosin head?

Correct AnswerverifiedShow Answer

Which of the following occurs during recovery from oxygen deficit?

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What type of muscle tissue has neuromuscular junctions?

Correct AnswerverifiedShow Answer

Which of the following changes have the potential to dramatically affect the potential difference across the plasma membrane?

Correct AnswerverifiedShow Answer

Which type of muscle tissue is multinucleated?

Correct AnswerverifiedShow Answer

Describe the H zone of the sarcomere. The H zone:

Correct AnswerverifiedShow Answer

As muscle activity increases, the body temperature _____.

Correct AnswerverifiedShow Answer

The time between application of the stimulus to a motor neuron and the beginning of contraction is called the _____ phase.

Correct AnswerverifiedShow Answer

Which type of muscle tissue causes contraction of the heart?

Correct AnswerverifiedShow Answer

Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?

Correct AnswerverifiedShow Answer

The elevated oxygen consumption relative to activity level after exercise has ended is called

Correct AnswerverifiedShow Answer

Betsy took a fall, broke her arm, and when she took the cast off she was alarmed to see that her muscles

Correct AnswerverifiedShow Answer

Curare blocks acetylcholine receptors at the motor end plate. This would result in

Correct AnswerverifiedShow Answer

ATPase is found in

Correct AnswerverifiedShow Answer

The stretch of elastic components of a muscle adds to the increased tension during

Correct AnswerverifiedShow Answer

During resting conditions, _________ is synthesized to store energy?

Correct AnswerverifiedShow Answer

Intense exercise that results in a great deal of anaerobic activity

Correct AnswerverifiedShow Answer

Aerobic respiration

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Which of the following statements regarding the sliding filament model is false?

Correct AnswerverifiedShow Answer

Which of the following structures contains the other four items listed?

Correct AnswerverifiedShow Answer

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