Question 1

What type of muscle tissue causes vasoconstriction?

Accepted Answer

A)  skeletal muscle
B)  smooth muscle
C)  cardiac muscleD) B) and C)
E) A) and C)

Question 2

Incomplete tetanus

Accepted Answer

A)  is the time during which the tissue cannot respond again.
B)  results in complete and incomplete tetanus.
C)  is the condition in which the muscle fiber only partially relaxes between contractions.
D)  is the condition in which stimuli occur so rapidly that there are no intervening relaxations.
E)  is the constant tension produced by muscles for long periods of time.F) C) and D)
G) B) and C)

Question 3

Which of the following events occurs during the lag phase of a muscle twitch?

Accepted Answer

A)  Muscle fibers shorten.
B)  Cross-bridges form,move,release,and reform many times.
C)  The action potential is propagated from presynaptic to postsynaptic membrane.
D)  Calcium is pumped back into the sarcoplasmic reticulum.
E)  All of these events occur in the lag phase.F) B) and C)
G) A) and E)

Question 4

Rigor mortis occurs after death because

Accepted Answer

A)  cross-bridges form but can't release.
B)  calcium is actively transported back to the sarcoplasmic reticulum.
C)  anaerobic respiration is occurring.
D)  myosin levels decline at death.
E)  cross-bridges never form.F) C) and D)
G) A) and C)

Question 5

A lack of glycolytic enzymes within skeletal muscle cells would impair which type of ATP-yielding process?

Accepted Answer

A)  anaerobic respiration
B)  aerobic respiration
C)  both anaerobic and aerobic respirationD) All of the above
E) A) and B)

Question 6

The region of the sarcomere that contains both actin and myosin myofilaments is called the

Accepted Answer

A)  I band.
B)  A band.
C)  Z disk.
D)  H zone.
E)  M line.F) C) and E)
G) B) and D)

Question 7

Inflammation of the fibrous connective tissue resulting in stiffness and soreness is

Accepted Answer

A)  cramps.
B)  fibrositis.
C)  fibrosis.
D)  muscular dystrophy.
E)  paralysis.F) B) and C)
G) B) and D)

Question 8

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 B)
G) A) and C)

Question 9

What type of muscle tissue causes peristalsis?

Accepted Answer

A)  skeletal muscle
B)  smooth muscle
C)  cardiac muscleD) A) and B)
E) B) and C)

Question 10

Which of the following helps explain the increased tension seen in multiple wave summation?

Accepted Answer

A)  increased motor unit recruitment
B)  increased concentration of calcium ions around the myofibrils
C)  exposure of more active sites on myosin myofilaments
D)  the breakdown of elastic elements in the cell
E)  decreased stimulus frequencyF) C) and D)
G) B) and D)

Question 11

What is a triad?

Accepted Answer

A)  a protein found along the groove of the F-actin double helix
B)  a T tubule and two adjacent terminal cisternae
C)  the combination of myosin heads with active sites on actin molecules
D)  the movement of myosin head while attached to actin myofilament
E)  after exercise,the oxygen taken in that exceeds the oxygen required for resting metabolismF) None of the above
G) A) and B)

Question 12

The refractory period

Accepted Answer

A)  is the time during which the tissue cannot respond again.
B)  results in complete and incomplete tetanus.
C)  is the condition in which the muscle fiber only partially relaxes between contractions.
D)  is the condition in which stimuli occur so rapidly that there are no intervening relaxations.
E)  is the constant tension produced by muscles for long periods of time.F) A) and E)
G) B) and E)

Question 13

Arrange these structures as they participate in excitation-contraction.

Accepted Answer

A)  T tubules,sarcolemma,calcium ions,sarcoplasmic reticulum
B)  calcium ions,T tubules,sarcolemma,sarcoplasmic reticulum
C)  sarcolemma,T tubules,sarcoplasmic reticulum,calcium ions
D)  sarcoplasmic reticulum,calcium ions,T tubules,sarcolemma
E)  sarcolemma,sarcoplasmic reticulum,calcium ions,T tubulesF) None of the above
G) A) and B)

Question 14

-What does "B" represent on the diagram?

Accepted Answer

A)  threshold
B)  depolarization
C)  depolarization phase of action potential
D)  repolarization phase of action potentialE) None of the above
F) A) and B)

Question 15

Heather is watching a movie.What type of chemical pathway do her muscles depend upon at this time?

Accepted Answer

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

Question 16

Multiple wave summation

Accepted Answer

A)  is a time during which the tissue cannot respond again.
B)  results in complete and incomplete tetanus.
C)  is a condition in which the muscle fiber only partially relaxes between contractions.
D)  is a condition in which stimuli occur so rapidly that there are no intervening relaxations.
E)  is a constant tension produced by muscles for long periods of time.F) A) and D)
G) None of the above

Question 17

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) A) and B)
G) C) and E)

Question 18

Maureen is hiking in the cold,and to maintain homeostasis her body begins to

Accepted Answer

A)   increase heat loss from the skin.
B)   release chemicals to initiate a high fever.
C)   shiver.
D)   reduce her blood pressure.
E)   vasodilate vessels in her head and neck.F) B) and C)
G) A) and E)

Question 19

Increased strength of a trained muscle is due to

Accepted Answer

A)  an increased number of muscle fibers.
B)  the nervous system's ability to recruit a large number of motor units simultaneously.
C)  elimination of unnecessary enzymes and metabolic pathways.
D)  elimination of all fat deposits.
E)  elimination of unnecessary connective tissue.F) All of the above
G) B) and C)

Question 20

The model that describes the contraction of the muscle is called the

Accepted Answer

A)  contraction cycle.
B)  power stroke.
C)  sliding filament model.
D)  slipping fibril mechanism.
E)  paddle model.F) A) and E)
G) All of the above

Exam 9: Muscular System: Histology and Physiology

Inflammation of the fibrous connective tissue resulting in stiffness and soreness is

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-What does "B" represent on the diagram?

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Increased strength of a trained muscle is due to

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

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Which of the following helps explain the increased tension seen in multiple wave summation?

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What type of muscle tissue causes vasoconstriction?

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The model that describes the contraction of the muscle is called the

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Rigor mortis occurs after death because

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Arrange these structures as they participate in excitation-contraction.

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The refractory period

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A lack of glycolytic enzymes within skeletal muscle cells would impair which type of ATP-yielding process?

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Multiple wave summation

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The region of the sarcomere that contains both actin and myosin myofilaments is called the

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Incomplete tetanus

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What type of muscle tissue causes peristalsis?

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Maureen is hiking in the cold,and to maintain homeostasis her body begins to

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

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What is a triad?

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Heather is watching a movie.What type of chemical pathway do her muscles depend upon at this time?

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Which of the following events occurs during the lag phase of a muscle twitch?

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