Muscle part 3

Question 1

What are the 3 phases of muscle twitch?

Answer 1

1. Latent phase
2. Contraction phase
3. Relaxation

Question 2

What happens in the Latent phase?

Answer 2

signal for SR release of calcium, which then diffuses and bunts to troponin

Question 3

What happens in the Contraction phase?

Answer 3

actin myosin cross-bridges form and power stroke of contraction draws the thin myofilaments (actin) towards the center of the sarcomere

Question 4

What happens in Relaxation?

Answer 4

calcium is sequestered from the sarcoplasm back into the SR, tropomyosin reverts back to the position physically blocking the actin-myosin binding sites

Question 5

The two factor that dictate graded response are:

Answer 5

1. Frequency of stimulation

2. Strength of stimulus

Question 6

What are the types of contraction?

Answer 6

Isotonic

Isometric

Question 7

_____ length of muscle changes as uniform tension is generated, resulting in movement

Answer 7

Isotonic

Question 8

_____ although tension is generated the muscle does not shorten because the tension does not exceed the resistance, thus position is maintained.

Answer 8

Isometric