Chapter 10 Physiology lecture

Question 1

What is a motor unit

Answer 1

Nerve and all the muscle fibers it connects with

Question 2

What is the “All or none principle”

Answer 2

Either the action potential is strong enough to contract all the muscle fibers or it is not strong enough to contract any.

Question 3

What is a slow twitch muscle? What type is it?

Answer 3

Muscle fibers not capable of high intensity contractions and are associated with endurance and postural muscles.
type 1

Question 4

What is a fast twitch muscle? What type is it ?

Answer 4

Muscle fibers that are capable of producing high intensity, high velocity twitches, help with sudden burst of energy involved in activities like sprinting , jumping

type 2

Question 5

What is the function of a muscle spindle?

Answer 5

Sense strength and/or range of length change in a muscle and cause a contraction

Question 6

What is a golgi tendon?

Answer 6

Respond to high levels of tension which will cause the muscle to relax.

Question 7

List 4 components of the sliding filament theory

Answer 7

Actin
Myosin
Tropomyosin
Troponin

Question 8

What is a crossbridge?

Answer 8

Where the actin and myosin contract and come together

Question 9

What are 3 types of contractions?

Answer 9

Concentric, eccentric , isometric

Question 10

Describe how the type of contractions work with force

Answer 10

Concentric- movement occurs when the muscle lengthens

Eccentric- Slightly controls and lenghtens

Isometric- Nothing moves, no change