Contraction 16

Question 1

Is ATP required for relaxation

Answer 1

yes

Question 3

Muscle Twitch

Answer 3

1 action potential on a muscle fiber results in a muscle twitch (quick, weak contraction).

Question 4

Latent period

Answer 4

The delay between the start of the action potential and the start of the twitch is called “latent period

Question 5

Partner question: What is responsible for the force produced by muscle fibers?

Answer 5

The force generated by individual muscle filaments
And the number of muscle fibers contracting

Question 6

More simply put, the more crossbridges, either on within a fiber or as increasing the number of fibers, that you can form will equate to the more force you can generate

Question 7

Tetanus

Answer 7

max stimulus and you can’t contract anymore, sarcomere is shortest length

Question 8

Force Production by Individual Muscle Fibers

Answer 8

determined by
Frequency of stimulation.
Fiber length.
Fiber diameter

Question 9

What causes muscle fatigue?

Answer 9

Loss of ATP
Accumulation of metabolites
Loss of nerve signaling
Decreased oxygen
Emotional stress

Question 10

cortisol

Answer 10

stress hormone

Question 11

muscles are constantly stressed

Answer 11

satellite cells emerge from damaged fibers, proliferate, and add their mass. boosting muscle growth

Question 12

muscle hypertorphy

Answer 12

Fiber’s expand, increase myonuclei number

Question 13

What does Oxygen tension dictates satellite cell phenotypes

Answer 13

if satellite cells convert muscle to more muscle or fat
Free radicals change ecosystem of cell

20% O2 (Fat)
6% O2 (muscle)
3% O2 Bone (Stoneman’s disease)

Question 14

satellite cells decrease as you get older

Answer 14

yes