sliding filament mechanism steps

Question 1

(1) nerve impulses arrive at

Answer 1

the axon terminal

Question 2

once the impulses arrives at the axon terminal

Answer 2

ACH is released and diffused across the synapse to the sarcolemma

Question 3

(2) ACH bonds with

Answer 3

ACH receptors

Question 4

ACH bond makes

Answer 4

sarcolemma more permeable to sodium ions to rush into the cell

Question 5

(3) sarcolemma

Answer 5

depolarizes

Question 6

once the sarcolemma depolarizes

Answer 6

T Tubules bring reversal of charge to inferior of muscle cells

Question 7

(4) depolarization stimulates release of

Answer 7

Ca2 ions from sarcoplasmic reticulum

Question 8

once depolarization stimulates the release of Ca2 ions

Answer 8

Ca2 ions bond to the troponin-tropomyosin complex

Question 9

troponin-tropomyosin complex

Answer 9

shifts Ca2 ions away from actin filaments

Question 10

(5) myosin splits ATP to

Answer 10

release its energy

Question 11

(also 5) bridges on the myosin attach to actin filaments and

Answer 11

pull them toward the center of the sarcomere

Question 12

the pulling towards the center of the sarcomere makes

Answer 12

the sarcomere shorter

Question 13

(6) all of sarcomeres in a muscle fiber

Answer 13

shorten and the entire muscle fiber contracts

Question 14

step 7

Answer 14

sarcolemma repolarizes

Question 15

(8) cholinesterase in sarcolemma

Answer 15

inactivates ACH

Question 16

(9) subsequent nerve impulses will

Question 17

(9) subsequent nerve impulses will

Answer 17

prolong contractions (more ACH released)

Question 18

(10) when there are no more nerve impulses

Answer 18

the muscle fiber will relax and return to original length

Question 19

steps 1-8 (twitch)

Answer 19

describe a single muscle fiber contraction in a response to a single nerve impulse

Question 20

because all of this takes place in less than a second

Answer 20

useful movements would not be possible if muscle fibers relaxed immediately after contracting

Question 21

tetanus

Answer 21

sustained contractions

Question 22

tetanus/sustained contractions

Answer 22

nerve impulses arrive in a continuous stream and produced sustained contraction

Question 23

when in tetanus

Answer 23

muscle fibers remain contracted and are capable of effective movement