Question 1

Oxygen debt in muscles may develop because of

Accepted Answer

A)  the inability of respiratory and circulatory systems to supply enough oxygen to skeletal muscles when used strenuously for a minute or two.
B)  the inability of myoglobin molecules to store enough oxygen when skeletal muscles are used strenuously for a minute or two.
C)  too much oxygen used in forming pyruvic acid when skeletal muscles are contracted strenuously for a minute or two.
D)  too high a concentration of oxygen in the atmosphere.E) A) and B)
F) None of the above

Question 2

Fibers of muscles whose motor neurons are severed

Accepted Answer

A)  hypertrophy.
B)  may be replaced by fat or fibrous connective tissue.
C)  cannot ever be reinnervated.
D)  die as their sarcomeres are progressively eliminateD.E) A) and D)
F) B) and C)

Question 3

In order to stimulate skeletal muscle fibers,motor neurons release the neurotransmitter ______.

Accepted Answer

The answer of In order to stimulate skeletal muscle fibers,motor...

Question 4

Which of the following statements is correct?

Accepted Answer

A)  Tropomyosin molecules move and expose specific sites on myosin filaments.
B)  Actin filaments slide along myosin filaments.
C)  Cross-bridges form between actin and the sarcolemma.
D)  Filaments of troponin and tropomyosin slide past one another.E) None of the above
F) All of the above

Question 5

A gluteal gait,in which a person walks with a waddling limp,is usually caused by a disorder of the

Accepted Answer

A)  gluteus maximus and gluteus medius.
B)  gluteus maximus and gluteus minimus.
C)  gluteus medius and gluteus minimus.
D)  gluteus maximus and tensor fasciae latae.E) A) and C)
F) A) and B)

Question 6

Neurotransmitters are stored in vesicles in

Accepted Answer

A)  myofibrils.
B)  motor units.
C)  motor end plates.
D)  motor neuron endings.E) C) and D)
F) A) and D)

Question 7

The structures that connect cardiac muscle cells are

Accepted Answer

A)  intervertebral discs.
B)  neuromuscular junctions.
C)  intercalated discs.
D)  motor end plates.E) B) and D)
F) All of the above

Question 8

A motor unit is

Accepted Answer

A)  many myofibrils in a sarcolemmA.
B)  many motor end plates at a neuromuscular junction.
C)  a motor neuron and the muscle fibers connected to it.
D)  the functional unit of a muscle fiber.E) B) and C)
F) A) and D)

Question 9

Functions of muscles include

Accepted Answer

A)  heartbeat.
B)  muscle tone.
C)  moving bones.
D)  all of the above.E) All of the above
F) C) and D)

Question 10

Transverse tubules

Accepted Answer

A)  store sodium ions for the action potential at the cell surface.
B)  transmit muscle impulses into the cell interior.
C)  store calcium ions.
D)  connect actin and myosin.E) A) and C)
F) None of the above

Question 11

The amount of oxygen liver cells require to support the conversion of lactic acid to produce glucose or glycogen is the

Accepted Answer

A)  refractory quantity.
B)  oxygen debt.
C)  anaerobic concentration.
D)  aerobic conversion.E) C) and D)
F) A) and D)

Question 12

The linea alba is

Accepted Answer

A)  a muscle extending from the ischial spine to the coccyx and sacrum.
B)  a curved,broad muscle on the side of the chest.
C)  a muscle beneath the skull.
D)  a band of tough connective tissue to which abdominal wall muscles attach.E) B) and C)
F) A) and B)

Question 13

Binding sites on the surface of actin allow the formation of cross-bridges with molecules of

Accepted Answer

A)  ATP.
B)  myosin.
C)  troponin.
D)  tropomyosin.E) All of the above
F) B) and C)

Question 14

Transverse tubules and sarcoplasmic reticulum are well developed in

Accepted Answer

A)  smooth muscle fibers.
B)  skeletal muscle fibers.
C)  cardiac muscle fibers.
D)  skeletal and cardiac muscle fibers.E) B) and C)
F) A) and C)

Question 15

The functional unit of muscle contraction is

Accepted Answer

A)  the muscle.
B)  the muscle fiber.
C)  the myosin cross-bridge.
D)  the sarcomere.E) B) and C)
F) A) and D)

Question 16

Muscles that assist an agonist are called ______.

Accepted Answer

The answer of Muscles that assist an agonist are called...

Question 17

A myogram is

Accepted Answer

A)  a chart that shows how many muscle cells a neuron synapses with.
B)  a recording of the events of a twitch.
C)  a measurement of muscle tone.
D)  a depiction of the results of a stress test.E) A) and C)
F) None of the above

Question 18

Threshold stimulus is the

Accepted Answer

A)  maximum stimulus required to release acetylcholine.
B)  minimum stimulus required to produce ATP.
C)  maximum stimulus required to contract a muscle.
D)  minimum strength of stimulation required to contract a muscle fiber.E) C) and D)
F) B) and D)

Question 19

Which of the following is not true?

Accepted Answer

A)  Red fibers contract more slowly than white.
B)  Red fibers contain more myoglobin than white.
C)  Red fibers have fewer mitochondria than white.
D)  Red fibers fatigue more slowly than white.E) A) and C)
F) B) and C)

Question 20

The type of muscle cell that lacks transverse tubules,has a single nucleus,and is under involuntary control is

Accepted Answer

A)  skeletal muscle.
B)  smooth muscle.
C)  cardiac muscle.
D)  striated muscle.E) None of the above
F) All of the above

Exam 9: Muscular System

Which of the following statements is correct?

Correct AnswerverifiedShow Answer

The type of muscle cell that lacks transverse tubules,has a single nucleus,and is under involuntary control is

Correct AnswerverifiedShow Answer

Oxygen debt in muscles may develop because of

Correct AnswerverifiedShow Answer

Threshold stimulus is the

Correct AnswerverifiedShow Answer

A gluteal gait,in which a person walks with a waddling limp,is usually caused by a disorder of the

Correct AnswerverifiedShow Answer

Transverse tubules

Correct AnswerverifiedShow Answer

Muscles that assist an agonist are called ______.

Correct AnswerverifiedShow Answer

Transverse tubules and sarcoplasmic reticulum are well developed in

Correct AnswerverifiedShow Answer

The functional unit of muscle contraction is

Correct AnswerverifiedShow Answer

Neurotransmitters are stored in vesicles in

Correct AnswerverifiedShow Answer

In order to stimulate skeletal muscle fibers,motor neurons release the neurotransmitter ______.

Correct AnswerverifiedShow Answer

The linea alba is

Correct AnswerverifiedShow Answer

Functions of muscles include

Correct AnswerverifiedShow Answer

Binding sites on the surface of actin allow the formation of cross-bridges with molecules of

Correct AnswerverifiedShow Answer

The structures that connect cardiac muscle cells are

Correct AnswerverifiedShow Answer

Fibers of muscles whose motor neurons are severed

Correct AnswerverifiedShow Answer

A motor unit is

Correct AnswerverifiedShow Answer

A myogram is

Correct AnswerverifiedShow Answer

Which of the following is not true?

Correct AnswerverifiedShow Answer

The amount of oxygen liver cells require to support the conversion of lactic acid to produce glucose or glycogen is the

Correct AnswerverifiedShow Answer

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