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When smooth muscle is stretched for a prolonged period of time,it responds by


A) contracting.
B) relaxing.

C) A) and B)
D) undefined

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A flat,thin structure made of dense connective tissue that serves to attach a muscle to a bone (or to another muscle) is a(n)


A) aponeurosis.
B) tendon.
C) perimysium.
D) myolemma.
E) superficial fascia.

F) B) and D)
G) None of the above

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Smooth muscle cells tend to be shorter but thicker than skeletal muscle cells.

A) True
B) False

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The embryonic-like cells that remain in adult skeletal muscle tissue are known as satellite cells.

A) True
B) False

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When a muscle relaxes,


A) crossbridges form and muscle extensibility returns the muscle to rest length.
B) crossbridges form and muscle elasticity returns the muscle to rest length.
C) crossbridges stop forming and muscle elasticity returns the muscle to rest length.
D) crossbridges stop forming and muscle extensibility returns the muscle to rest length

E) A) and B)
F) All of the above

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A skeletal muscle cell contains hundreds to thousands of _________,which are complex organelles;they are cylindrical in shape-about 2 micrometers in diameter and as long as the cell.


A) myofibrils
B) microfilaments
C) sarcomeres
D) T-tubules
E) sarcolemma

F) B) and E)
G) A) and B)

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The presence of mitochondria and myoglobin facilitate _________ respiration in muscle cells.


A) aerobic
B) anaerobic

C) A) and B)
D) undefined

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Increased phosphate ion concentration is believed to contribute to fatigue by interfering with


A) calcium release from the sarcoplasmic reticulum.
B) levels of available ATP to provide energy for contraction.
C) phosphate release by myosin heads during crossbridge cycling.
D) ACh release by synaptic knobs of motor neurons.

E) All of the above
F) A) and C)

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Myoglobin is a molecule within muscle cells that can bind


A) creatine phosphate.
B) oxygen.
C) hemoglobin.
D) acetylcholine.
E) ATP.

F) C) and D)
G) B) and D)

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Which letter is associated with a zone (in a relaxed muscle) that is a little more lightly shaded because only thick filaments are present


A) I
B) A
C) M
D) Z
E) H

F) All of the above
G) B) and C)

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A circular muscle band that contracts at an orifice is also known as a _______________.

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Because skeletal muscle cells are so close together,muscle contains very few blood vessels.

A) True
B) False

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The property of muscle tissue that allows an impulse to travel down the entire length of the cell membrane is


A) elasticity.
B) conductivity.
C) extensibility.
D) contractility.
E) responsibility.

F) B) and D)
G) A) and B)

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