muscles

Question 1

ATP is required to

Answer 1

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

Question 2

the power stoke causes the ….. to shorten

Answer 2

sarcomere

Question 3

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

Answer 3

myosin

Question 4

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

Answer 4

myosin

Question 5

troponin and tropomyosin proteins are bound together with….to make the “thin” filament.

Answer 5

actin

Question 6

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

Answer 6

sarcolemma

Question 7

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

Answer 7

sarcoplasmic reticulum

Question 8

actin is the … filament shaped like a “string pearls”

Answer 8

thin

Question 9

is shaped like a “golf club”

Answer 9

myosin

Question 10

ion exchange causes an electrical current to form

Answer 10

Na+

K+

Question 11

transverse tubules carry

Answer 11

electricity

Question 12

sarcoplasmic reticulum stores …. in the sarcomere

Answer 12

calcium

Question 13

the “cross bridge” is a connection between

Answer 13

actin and myosin

Question 14

the energy from ATP is required to separate myosin from actin

Answer 14

false

Question 15

Ca++ combines with…. to cause “lift off” from the active site on actin

Answer 15

troponin

Question 16

…motor nerves are voluntary muscle nerves.

Answer 16

somatic

Question 17

more cross bridge formation results in a

…. contraction

Answer 17

stronger

Question 18

…muscle requires nerves to initiate contraction

Answer 18

skeletal

Question 19

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

Answer 19

more