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RRPA Pathophysiology II > Muscle Group Activity Questions (Exam 2) > Flashcards

Muscle Group Activity Questions (Exam 2) Flashcards

1
Q 
Which of the following tissues contains intercalated discs?
A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. Two of the above
E. All of the above
A

C. Cardiac muscle

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2
Q

What is the correct order of muscle structures from the largest to smallest in diameter?
A. Muscle, fascicle, muscle fiber, myofibril
B. Fascicle, myofibril, muscle fiber, myofilament
C. Fascicle, muscle fiber, myofibril, muscle
D. Muscle, muscle fiber, myofibril, fascicle
E. Muscle, muscle fiber, myofibril, fascicle, myofilament

A

A. Muscle, fascicle, muscle fiber, myofibril

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3
Q 
Connective tissue that wraps around a group of skeletal muscles is called the 
A. Sarcomere
B. Sarcolemma
C. Endomysium
D. Sarcoplasmic reticulum
E. Deep fascia
F. Epimysium
G. Perimysium
A

E. Deep fascia

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4
Q 
The connective tissue that wraps around each skeletal muscle is called the 
A. Sarcomere
B. Sarcolemma
C. Endomysium 
D. Sarcoplasmic reticulum 
E. Epimysium 
F. Perimysium
G. Deep fascia
A

E. Epimysium

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5
Q 
The network of membraneous sacs that surround myofibrils are the 
A. Sarcomere
B. Sarcolemma
C. Endomysium 
D. Sarcoplasmic reticulum 
E. Epimysium 
F. Perimysium
G. Deep fascia
A

D. Sarcoplasmic reticulum

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6
Q 
The portion of the myofibril that contains the whole length of the thick filaments is the 
A. Z band
B. M band
C. H zone
D. A band
E. I band
A

D. A band

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7
Q

When nervous impulses arrive at the synaptic knob, which of the following occurs first?
A. Ca ions enter the sarcoplasmic reticulum
B. Ca ions leave the sarcoplasmic reticulum
C. Ca ions enter the synaptic knob
D. Ca ions leave the synaptic knob
E. Ca ions enter the muscle cell through sarcolemma

A

C. Ca ions enter the synaptic knob

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8
Q

When EPP arrive at the T-tubules, which of the following occurs first?
A. Ca ions enter the sarcoplasmic reticulum
B. Ca ions leave the sarcoplasmic reticulum
C. Ca ions enter the synaptic knob
D. Ca ions leave the synaptic knob
E. Ca ions enter the muscle cell through sarcolemma

A

E. Ca ions enter the muscle cell through sarcolemma

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9
Q 
In the neuromuscular junction, ACh receptors are located on the 
A. Membrane of synaptic vessels
B, Motor end plate
C. Sarcoplasmic reticulum
D. Membrane of synaptic knob
A

B. Motor end plate

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10
Q 
About 80% of the volume of a skeletal muscle cell is occupied by 
A. Sarcoplasm
B. Fascicles
C. Sarcoplasmic reticulum
D. Myofibrils
E. Myoglobin
A

D. Myofibrils

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11
Q 
Muscles appear red because they contain 
A. Sarcoplasm
B. Fascicles
C. Sarcoplasmic reticulum 
D. Myofibrils
E. Myoglobin
A

E. Myoglobin

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12
Q 
The function of \_\_\_\_\_\_ in muscle cells is storing oxygen. 
A. Glycogen
B. Sarcomere
C. Sarcoplasmic reticulum
D. Myofibrils
E. Myoglobin
A

E. Myoglobin

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13
Q

Which of the following is the function of T-tubules?
A. Store calcium ions
B. Store acetylcholine
C. Store glycogen
D. Transmit electrical signals into the muscle cells
E. Transmit electrical signals across synaptic knobs
F. Transmit actylcholine
G. Transport calcium ions

A

D. Transmit electrical signals into the muscle cells

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14
Q 
After training for a few months, a body builder's biceps brachii become much larger. His biceps brachii now contain more 
A. Muscle cells
B. Fascicles
C. Myofibrils
D. 2 of the above
E. All of the above
A

C. Myofibrils

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15
Q 
Which of the following is (are) found in the thin myofilament?
A. Mysoin
B. Actin
C. Myoglobin
D. Troponin
E. 2 of the above
F. All of the above
A

E. 2 of the above

actin. troponin

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16
Q 
In a relaxed muscle, myosin binding sites are blocked by 
A. ACh
B. Myosin
C. Troponin
D. Tropomyosin
E. Actin
A

D. Tropomyosin

17
Q 
After calcium ions are released into the sarcoplasm, they attach to calcium binding sites on 
A. Myosin
B. Actin
C. Tropomyosin
D. Troponin
E. Actin
A

D. Troponin

18
Q

Botox paralyzes muscles by
A. Preventing the brain from sending nerve signals
B. Preventing the transmission of nerve signals along nerves
C. Inhibiting the formation of ACh
D. Preventing the release of ACh
E. Blocking ACh receptors
F. Blocking the calcium binding sites

A

D. Preventing the release of ACh

19
Q 
During the process of muscle contraction, cross-bridges are formed
A. b/w myosin heads an troponins 
B. b/w myosin heads and actins 
C. b/w myosin heads and tropomyosins 
D. b/w actin heads and troponins 
E. b/w actin heads and calcium ions 
F. b/w myosin heads & calcium ions 
G. b/w Ach and Ach receptors
A

B. b/w myosin heads and actins

20
Q 
During the process of muscle contraction, power stroke means 
A. Swiveling (bending) myosin heads
B. Swiveling (bending) tropomyosin
C. Resetting (unbending) myosin heads
D. Resetting (unbending) tropomyosin
E. Releasing power from ATP
A

A. Swiveling (bending) myosin heads

21
Q 
If you are studying the neuromuscular transmitter that is released from the axon terminals, you would be studying
A. Lactic acid
B. Acetylcholine
C. Creatinine phosphatase
D. Calcium ions
E. ATP
A

B. Acetylcholine

22
Q

Sprinting is a sport that requires an explosion of energy more than endurance. The better type of muscle would be
A. Slow-twitch fibers with many mitochondria and a higher blood supply
B. Slow-twitch fibers with fewer mitochondria and a lower blood supply
C. Fast-twitch fibers with many mitochondria and a higher blood supply
D. Fast-twitch fibers with fewer mitochondria and a lower blood supply
E. Slow-twitch fibers with a reserve of glycogen and fat

A

D. Fast-twitch fibers with fewer mitochondria and a lower blood supply

23
Q

A professional bodybuilder displays an increase in muscle size called hyperplasia.
A. True
B. False

A

B. False

24
Q

The sequence for smooth muscle contraction is
A. Increased cytosolic calcium, which binds to troponin, then the complex binds with myosin light-chain kinase, which uses ATP to phosphorylate myosin cross-bridges, which binds to actin filament, resulting in contraction.
B. Increased cytosolic calcium, which binds to calmodulin in cytosol, which binds with myosin cross-bridges, resulting in contraction
C. Increased cytosolic calcium, which binds to calmodulin in cytosol, which moves tropomyosin from blocking active sites on actin filament, which binds with myosin cross-bridges, resulting in contraction
D. Increased cytosolic calcium, which binds to troponin, which moves tropomyosin from blocking active sites on actin filament, which binds with myosin cross-bridges, resulting in contraction
E. Increased cytosolic calcium, which binds to calmodulin in cytosol, the complex of which binds with myosin light-chain kinase, which uses ATP to phosphorylate myosin cross-bridges, which binds to actin filaments, resulting in contraction.

A

E. Increased cytosolic calcium, which binds to calmodulin in cytosol, the complex of which binds with myosin light-chain kinase, which uses ATP to phosphorylate myosin cross-bridges, which binds to actin filaments, resulting in contraction.

25
Q

Which of the following statements is true concerning calcium ions?
A. In smooth muscle, it binds with calmodulin
B. In skeletal muscle, it binds with calmodulin
C. In smooth muscle, it binds with troponin
D. In skeletal muscle, it binds with tropomyosin
E. In smooth muscle, it binds with myosin light-chain kinase

A

A. In smooth muscle, it binds with calmodulin

26
Q

The sequence for skeletal muscle contraction is
A. Increased cytosolic calcium, binds to troponin, this complex binds with myosin light-chain kinase, which uses ATP to phosphorylate myosin cross-bridges, which bind to actin filaments, resulting contraction
B. Increased cytosolic calcium, which binds to calmodulin in cytosol, which binds with myosin cross-bridges, resulting in contraction
C. Increased cytosolic calcium, which bind to calmodulin in cytosol, which moves tropomyosin from blocking the binding sites on actin filaments, which bind with myosin cross-bridges, resulting in contraction
D. Increased cytosolic calcium, which binds troponin, which moves tropomyosin from blocking the binding sites on actin filaments, which then binds myosin heads creating a cross-bridge, resulting in contraction
E. Increased cytosolic calcium, which bind to calmodulin in cytosol, which binds with myosin light-chain kinase, which uses ATP to phosphorylate myosin cross-bridges, which bind to actin filaments which results in contraction

A

D. Increased cytosolic calcium, which binds troponin, which moves tropomyosin from blocking the binding sites on actin filaments, which then binds myosin heads creating a cross-bridge, resulting in contraction

27
Q

During temporal summation (aka, wave summation),
A. A muscle fiber under continuous stimulation and contraction becomes unable to contract at all until it has rested
B. Muscle fiber stimulations are such that muscle fibers can fully contract and then completely relax before the next contraction
C. The stimuli arrive at the muscle fiber at such a rate that the muscle fiber is unable to completely relax between stimuli, and sequential contractions exhibit an equal contractive force that is greater than when the muscle fiber is allowed to rest completely.
D. A second stimulus arrives at the muscle before complete relaxation of the first contraction, causing the second contraction to have greater maximal tension than the first one.
E. The stimuli arrive at the muscle fiber so rapidly that there is no muscle relaxation between stimuli, but rather, a continuous contraction of the muscle fiber

A

D. A second stimulus arrives at the muscle before complete relaxation of the first contraction, causing the second contraction to have greater maximal tension than the first one.

RRPA Pathophysiology II (16 decks)

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