Question 1

Which of the following is not a characteristic of a muscle cell?

Accepted Answer

A)  plasticity
B)  contractility
C)  conductivity
D)  extensibility
E)  excitability

Question 2

Exposure to Clostridium tetani causes continuous release of acetylcholine.What effect does this have on smooth muscle?

Accepted Answer

A)  flaccid paralysis
B)  spastic paralysis
C)  lockjaw
D)  no effect
E)  myocardial atrophy

Question 3

In comparison to skeletal muscle, smooth muscle

Accepted Answer

A)  contracts more slowly but relaxes more rapidly.
B)  contracts more rapidly but relaxes more slowly.
C)  contracts and relaxes more slowly.
D)  consumes more ATP to maintain a given level of muscle tension.
E)  depends on a nerve fiber to supply the calcium needed for contraction.

Question 4

Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise.Increased oxygen supply results in

Accepted Answer

A)  increased glycolysis.
B)  increased use of myokinase.
C)  longer aerobic respiration.
D)  longer anaerobic fermentation.
E)  reduced ATP consumption.

Question 5

To stimulate muscle contraction, acetylcholine is released from the into the synaptic cleft.

Accepted Answer

A)  synaptic knob
B)  junctional folds
C)  sarcoplasmic reticulum
D)  sarcolemma
E)  terminal cisterna

Question 6

The purpose of varicosities in motor nerve fibers in muscle physiology is

Accepted Answer

A)  to link the thin filaments to the inside of the sarcolemma in smooth muscle.
B)  to reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down.
C)  to enable each cardiac myocyte to directly stimulate its neighbors.
D)  to release neurotransmitter onto smooth muscle cells.
E)  to prevent single-unit smooth muscle cells from pulling apart.

Question 7

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H
band.

Accepted Answer

A) True 
 B)False

Question 8

Which fibers are primarily responsible for producing lactic acid?

Accepted Answer

A)  type I slow oxidative fibers
B)  type IIA intermediate glycolytic fibers
C)  type IIB fast glycolytic fibers
D)  type I slow-twitch fibers
E)  red fibers

Question 9

Which of the following systems would provide energy for a racquetball player?

Accepted Answer

A)  the respiratory system
B)  the glycolysis system
C)  the phosphagen system
D)  the anaerobic system
E)  glycogen-lactic acid system

Question 10

A skeletal muscle generates the greatest tension when it is

Accepted Answer

A)  greatly stretched before being stimulated.
B)  partially stretched before being stimulated.
C)  fully relaxed before being stimulated.
D)  well-rested and low in creatine phosphate.
E)  in a state of treppe.

Question 11

The protein that acts as a calcium receptor in skeletal muscle is

Accepted Answer

A)  F actin.
B)  tropomyosin.
C)  troponin.
D)  titin.
E)  dystrophin.

Question 12

The absence or inhibition of acetylcholinesterase at a synapse would lead to which of the following?

Accepted Answer

A)  flaccid paralysis
B)  tetanus
C)  atrophy
D)  numbness
E)  muscle wasting

Question 13

The contraction strength of smooth muscle is relatively independent of its resting length partly because

Accepted Answer

A)  it gets nearly all of its Ca₂+ from the extracellular fluid.
B)  it does not have intercalated discs.
C)  it does not have sarcomeres.
D)  it is regulated by a length-tension relationship.
E)  it is involuntary muscle.

Question 14

The bladder's ability to greatly distend and return to normal tension is due to the of smooth muscles.

Accepted Answer

A)  elasticity
B)  longevity
C)  tensile strength
D)  plasticity
E)  tone

Question 15

Loss of muscle mass from lack of activity is termed

Accepted Answer

A)  myopathy.
B)  dystrophy.
C)  apathy.
D)  atrophy.
E)  treppe.

Question 16

Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers.

Accepted Answer

A) True 
 B)False

Question 17

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be

Accepted Answer

A)  fatigue.
B)  treppe.
C)  incomplete tetanus.
D)  complete tetanus.
E)  flaccid paralysis.

Question 18

An isometric contraction does not change muscle length.

Accepted Answer

A) True 
 B)False

Exam 11: Muscular Tissue

An isometric contraction does not change muscle length.

Correct Answer
verified

Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers.

Correct Answer
verified

Exposure to Clostridium tetani causes continuous release of acetylcholine.What effect does this have on smooth muscle?

Correct Answer
verified

To stimulate muscle contraction, acetylcholine is released from the into the synaptic cleft.

Correct Answer
verified

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band.

Correct Answer
verified

The purpose of varicosities in motor nerve fibers in muscle physiology is

Correct Answer
verified

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be

Correct Answer
verified

The absence or inhibition of acetylcholinesterase at a synapse would lead to which of the following?

Correct Answer
verified

Loss of muscle mass from lack of activity is termed

Correct Answer
verified

Which of the following is not a characteristic of a muscle cell?

Correct Answer
verified

In comparison to skeletal muscle, smooth muscle

Correct Answer
verified

The contraction strength of smooth muscle is relatively independent of its resting length partly because

Correct Answer
verified

Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise.Increased oxygen supply results in

Correct Answer
verified

A skeletal muscle generates the greatest tension when it is

Correct Answer
verified

Which fibers are primarily responsible for producing lactic acid?

Correct Answer
verified

The protein that acts as a calcium receptor in skeletal muscle is

Correct Answer
verified

Which of the following systems would provide energy for a racquetball player?

Correct Answer
verified

The bladder's ability to greatly distend and return to normal tension is due to the of smooth muscles.

Correct Answer
verified

Exam 11: Muscular Tissue

An isometric contraction does not change muscle length.

Correct AnswerverifiedShow Answer

Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers.

Correct AnswerverifiedShow Answer

Exposure to Clostridium tetani causes continuous release of acetylcholine.What effect does this have on smooth muscle?

Correct AnswerverifiedShow Answer

To stimulate muscle contraction, acetylcholine is released from the into the synaptic cleft.

Correct AnswerverifiedShow Answer

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band.

Correct AnswerverifiedShow Answer

The purpose of varicosities in motor nerve fibers in muscle physiology is

Correct AnswerverifiedShow Answer

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be

Correct AnswerverifiedShow Answer

The absence or inhibition of acetylcholinesterase at a synapse would lead to which of the following?

Correct AnswerverifiedShow Answer

Loss of muscle mass from lack of activity is termed

Correct AnswerverifiedShow Answer

Which of the following is not a characteristic of a muscle cell?

Correct AnswerverifiedShow Answer

In comparison to skeletal muscle, smooth muscle

Correct AnswerverifiedShow Answer

The contraction strength of smooth muscle is relatively independent of its resting length partly because

Correct AnswerverifiedShow Answer

Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise.Increased oxygen supply results in

Correct AnswerverifiedShow Answer

A skeletal muscle generates the greatest tension when it is

Correct AnswerverifiedShow Answer

Which fibers are primarily responsible for producing lactic acid?

Correct AnswerverifiedShow Answer

The protein that acts as a calcium receptor in skeletal muscle is

Correct AnswerverifiedShow Answer

Which of the following systems would provide energy for a racquetball player?

Correct AnswerverifiedShow Answer

The bladder's ability to greatly distend and return to normal tension is due to the of smooth muscles.

Correct AnswerverifiedShow Answer

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