Objective 18

Question 0

In what two ways are speed of contraction determined?

Answer 0

• by speed at which ATPases split ATP

- by pattern of electrical activity of the motor neurons

Question 1

How are muscle fiber types classified?

Answer 1

according to speed of contraction and ATP-forming pathways

Question 2

What are the two Metabolic pathways for ATP synthesis?

Answer 2

Oxidative fibers

Glycolytic fibers

Question 3

What pathways do Oxidative fibers use?

Answer 3

Aerobic pathways

Question 4

What pathways do Glycolytic fibers use?

Answer 4

Anaerobic glycolysis

Question 5

Describe Oxidative fibers

Answer 5

Contain many mitochondria, large myoglobin stores, and numerous blood vessels

Question 6

Describe Glycolytic fibers

Answer 6

Relatively fewer mitochondria, minimal myoglobin stores and fewer blood vessels

Question 7

What two criteria define the three categories of fibers?

Answer 7

Slow oxidative (SO) fibers and Fast oxidative (FO) fibers
Only have fast glycolytic (FG) fibers

Question 8

What defines order of recruitment?

Answer 8

functional characteristics and appearance

Question 9

Describe the Order of Recruitment for SO

Answer 9

SO (endurance activities) appear “red” – maintaining posture, slow steady walking

Question 10

Describe Order of recruitment for FO

Answer 10

FO (moderate acivities) appear “pink” - fast walking, sprinting

Question 11

Describe Order of recruitment for FG

Answer 11

FG (short bursts of power); appear “white” - broad jump, punching a bag

Question 12

What does “SO” mean?

Answer 12

Endurance activities

Question 13

What does “FO” mean?

Answer 13

Moderate activities

Question 14

What does “FG” mean?

Answer 14

Short burst of power