SKELETAL MUSCLE MECHANICS

Question 1

What are the three phases of the twitch contraction

Answer 1

Latent period, contraction period, relaxation period

Question 2

What happens during the latent period

Answer 2

The time it takes for the AP to propegate across the sarcolemma

Question 3

What happens during the contraction period

Answer 3

cross bridge cycling generates muscle tension

Question 4

what happens during relaxation period

Answer 4

ca ions pumps back into the SR and muscle tension returns to resting state

Question 5

The total amount of tension produced in 1 muscle fiber depends on:

Answer 5

The frequency of action potential firing in the motot neuron and the length of the muscle fiber at rest.

Question 6

What happens during unfused tetanus

Answer 6

muscle fibre has time to partially relax between stimuli. can get tension up to 80% of maximum

Question 7

What happens during fused tetanus

Answer 7

muscle fiber does not have time to relax at all between stimuli. Tension eventually reaches 100% of maximum