NBS Physiology- Muscular Flashcards Preview

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Flashcards in NBS Physiology- Muscular Deck (19):
1

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

B
S.R.

2

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

B
T-Tubules

3

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

C
2:1

4

This myofibril is thicker and prevalent in the ___ zone.
A. Myosin, I
B. Actin, I
C. Actin, H
D. Myosin, H

D
Myosin, H

5

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

D
Smooth

6

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

C
Tropomyosin

The MOM

7

ATPase attaches to the ________ _______ in a cross bridge.

Myosin Head

8

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

C
Troponin

9

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

I band
A band

10

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

True

11

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

False

Not in smooth

12

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

D
Eccentric

13

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

C
Concentric

14

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

B

15

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

C

16

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

C
Z to Z

17

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

C
BOTH

18

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

Only Actin

19

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

C
Only myosin