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Flashcards in muscles Deck (19)
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1

ATP is required to

release the myosin head after the power stroke.
energize the myosin for the next power stroke.
run Na/K and Na/Ca pumps

2

the power stoke causes the ..... to shorten

sarcomere

3

once the active site is revealed on the actin filament, a cross bridge forms with the head of the
.... filament

myosin

4

the power stoke occurs when the head of the ... filament flexes

myosin

5

troponin and tropomyosin proteins are bound together with....to make the "thin" filament.

actin

6

the cell membrane which contains receptors for ATP and channels for Na/K exchange.

sarcolemma

7

stimulation of the cell causes calcium to be released from the .... where it will then bind with troponin/ tropomyosin.

sarcoplasmic reticulum

8

actin is the ... filament shaped like a "string pearls"

thin

9

is shaped like a "golf club"

myosin

10

ion exchange causes an electrical current to form

Na+
K+

11

transverse tubules carry

electricity

12

sarcoplasmic reticulum stores .... in the sarcomere

calcium

13

the "cross bridge" is a connection between

actin and myosin

14

the energy from ATP is required to separate myosin from actin

false

15

Ca++ combines with.... to cause "lift off" from the active site on actin

troponin

16

...motor nerves are voluntary muscle nerves.

somatic

17

more cross bridge formation results in a
.... contraction

stronger

18

...muscle requires nerves to initiate contraction

skeletal

19

cross bridges form when extra calcium is released into the muscle fiber

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