Ch 9: Fiber Types

Question 1

Another name for each fiber type

Answer 1

Type 1 - slow oxidative
Type 2a - fast oxidative / glycolytic
Type 2x - fast glycolytic

Question 2

Fiber type differences between upper and lower limbs

Answer 2

Upper - Type II

Lower - Type I

Question 3

Fiber difference between multifidus and latissimus

Answer 3

Multifidus - type 1

Latissimus - type 2

Question 4

T or F

Type 2 muscles have more mitochondria than type 1

Answer 4

False - type 1 has more mitochondria than type 2

Question 5

T or F

Capillary density of type 2 muscle fibers is greater than type 1

Answer 5

False - type 1 muscle fiber capillary density is greater

Question 6

What does myoglobin do?

Answer 6

Transports O2 to and from the mitochondria and capillaries

Question 7

What dictates the type of muscle fiber?

Answer 7

ATPase ISO form located on light chain of the myosin heads

Question 8

What are the contractile properties of the muscle?

Answer 8

Max force production
Contractile velocity
Efficiency

Question 9

What fiber produces the greatest force?

Answer 9

2x

Question 10

What fiber produces more shortening velocity?

Answer 10

2x

Question 11

Why do type 1 muscle fibers fire first?

Answer 11

Smaller nerve cell bodies in the motor units

Question 12

What has the lowest inner action ratio?

Answer 12

Slow oxidative fibers

Question 13

What fiber type has the highest fatiguability?

Answer 13

Fast glycolytic

Question 14

Fast fatigue-resistance is what type of fiber type?

Answer 14

Fast oxidative, glycolytic