Lecture 13: Muscle 7

Question 1

Three types of skeletal muscle fibers

Answer 1

1. Slow oxidative (Type I)
2. Fast oxidative (Type IIA)
3. Fast glycolytic (Type IIB)

Question 2

Smallest skeletal muscle fiber

Answer 2

slow oxidative

Question 3

Slow oxidative fibers are also called

Answer 3

Slow-twitch

Fatigue-resistant

Question 4

Slow oxidative and fast oxidative contain large amounts of

Answer 4

• Myoglobin
• Mitochondria
• Blood capillaries

Question 5

Slow oxidative and fast oxidative color

Answer 5

red

Question 6

Slow oxidative and fast oxidative potential to generate ATP

Answer 6

high

Question 7

Slow oxidative split ATP at a slow rare and as a result have a slow

Answer 7

contraction velocity

Question 8

Slow oxidative are resistant to

Answer 8

fatigue

Question 9

Slow oxidative are found in large numbers where?

Answer 9

• Postural muscles

- Ex. Neck, legs

Question 10

Fiber with intermediate diameter

Answer 10

fast oxidative

Question 11

What are some other names for fast oxidative fibers

Answer 11

Fast-twitch A

Fatigue resistant

Question 12

Fast oxidative split ATP at a fast rate, thus

Answer 12

contraction velocity is fast

Question 13

Because fast oxidative rate of ATP production by oxidative phosphorylation cannot keep pace with the high rate of ATP splitting, they rely

Answer 13

partially on glycolysis and are more prone to fatigue than slow oxidative fibers

Question 14

Fast oxidative are well adapted for

Answer 14

jumping and sprinting

Question 15

What fibers are the largest in diameter?

Answer 15

Fast glycolytic

Question 16

What are two other names for fast glycolytic fibers

Answer 16

Fast twitch B

Fatigable

Question 17

Fast glycolytic fibers have low

Answer 17

myoglobin content
few mitochondria
few blood capillaries

Question 18

Fast glycolytic fibers have large amounts of

Answer 18

glycogen

Question 19

What color are glycolytic fibers?

Answer 19

white

Question 20

How do fast glycolytic fibers generate ATP?

Answer 20

By anaerobic processes (glycolysis)

Question 21

What fibers fatigue easily?

Answer 21

Fast glycolytic fibers

Question 22

Skeletal muscles are a mix of

Answer 22

all three types of fibers

Question 23

Can fibers of any one motor unit be different types?

Answer 23

Nope

Question 24

What are recruited for maximal contraction?

Answer 24

Fast glycolytic

Question 25

Activation of various motor units is determined by

Answer 25

The CNS