muscle fiber types

Question 1

what are the 3 different muscle types?

Answer 1

slow oxidative fibers (type 1), fast oxidative glycolytic fibers (type 2a), fast glycolytic fibers (type 2b)

Question 2

what are the structural characteristics of type 1 muscle fibers?

Answer 2

red, small, many mitochondria, many capillaries, high myoglobin concentration, low glycogen stores

Question 3

what are the structural characteristics of type 2a muscle fibers?

Answer 3

reddish pink, medium sized, many mitochondria, many capillaries, high myoglobin concentration, intermediate glycogen stores

Question 4

what are the structural characteristics of type 2b muscle fibers?

Answer 4

white/pale, large, few mitochondria, few capillaries, low myoglobin concentration, high glycogen stores

Question 5

what are the functional characteristics of type 1 muscle fibers?

Answer 5

slow contractile speed, low contractile strength, high fatigue resistance, high aerobic capacity, low anaerobic capacity

Question 6

what are the functional characteristics of type 2a muscle fibers?

Answer 6

fast contractile speed, intermediate contractile strength, moderate fatigue resistance, moderate aerobic capacity, high anaerobic capacity

Question 7

what are the functional characteristics of type 2b muscle fibers?

Answer 7

fast contractile speed, high contractile strength, low fatigue resistance, low aerobic capacity, high anaerobic capacity

Question 8

what are the muscle fibers best suited for?

Answer 8

type 1 marathon, type 2a 1500m, type 2b 100m

Question 9

what’s myoglobin?

Answer 9

o2 carrier/ storage of o2 in muscle fibers