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B2 > NBS Physiology- Muscular > Flashcards

NBS Physiology- Muscular Flashcards

1
Q 
What structure stores Ca++ to be released to skeletal muscle?
A. Sacrolemma
B. Sacroplasmic reticulum
C. Nucleus
D. Cytoplasm
A

B

S.R.

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2
Q 
The "telephone line" of an AP into the muscle to cause calcium release from the sacroplamic reticulum is:
A. Myosin
B. T-Tubules
C. Calmodulin
D. Myofibril
A

B

T-Tubules

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3
Q 
What is the ratio of actin to myosin:
A. 1:1
B. 4:1
C. 2:1
D. 3:1
A

C

2:1

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4
Q 
This myofibril is thicker and prevalent in the \_\_\_ zone.
A. Myosin, I
B. Actin, I
C. Actin, H
D. Myosin, H
A

D

Myosin, H

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5
Q

Calmodulin is required for _______ muscle contraction.
A. Cardiac
B. Skeletal
C. Smooth

A

D

Smooth

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6
Q 
Which of the following blocks/covers F actin's binding site?
A. Calcium
B. Myosin
C. Tropomyosin
D. Troponin
A

C
Tropomyosin

The MOM

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7
Q

ATPase attaches to the ________ _______ in a cross bridge.

A

Myosin Head

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8
Q 
Which of the following binds to calcium and pulls Tropomyosin off the binding sited?
A. Myosin
B. Sacrolemma
C. Troponin
D. Calmodulin
A

C

Troponin

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9
Q

During muscular contraction the _____ Band get smaller while the ______ Band remains the same

A

I band

A band

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10
Q

T/F: Rigor mortis occurs after death because the formed crossbridges cant release

A

True

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11
Q

T/F: Troponin is found in smooth, skeletal and cardiac muscle

A

False

Not in smooth

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12
Q 
Muscle lengthens when it contracts:
A. Isokinetic
B. Isometric
C. Concentric
D. Eccentric
A

D

Eccentric

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13
Q 
Muscle shortens when it contracts:
A. Isokinetic
B. Isometric
C. Concentric
D. Eccentric
A

C

Concentric

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14
Q

Alpha ventral root fibers are ________.
A. Intrafusal
B. Extrafusal

A

B

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15
Q

A motor unit is:
A. all the motor neurons and a single muscle fiber
B. a single motor neuron and a single muscle fiber innervated
C. a single motor neuron and all muscle fibers it innervates
D. All the motor neurons and all muscle fibers the innervate

A

C

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16
Q 
Sacromere spans:
A. H zone to H zone
B. Z line to I band
C. Z line to Z line
D. A band to A band
A

C

Z to Z

17
Q 
A band contains:
A. Only myosin
B. T-tubules
C. Both Actin and Myosin
D. Only Actin
A

C

BOTH

18
Q

The I band contains:
A. Both Actin and Myosin
B. Only Actin
C. Only Myosin

A

Only Actin

19
Q

The H band contains:
A. Both Actin and Myosin
B. Only Actin
C. Only Myosin

A

C

Only myosin

B2 (31 decks)

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