Muscle fibre types

Question 1

Two types of muscle fibres in body

Answer 1

• fast twitch (type 1
• slow twitch (type 2a and type 2b

Question 2

Slow twitch muscles

Answer 2

Smaller
red in colour- rich blood supply from lots of capillaries
high amount of oxidization

Question 3

Describe contraction of slow twitch muscles

Answer 3

can contract repeatedly but not forcefully
- suited to long distance, endurance exercise

Question 4

Fast twitch muscles (type 2 in general)

Answer 4

• bigger
• poor blood supply (thus pale colouring
• tend to become more anaerobic due to less blood supply

Question 4

Describe contraction of fast twitch (type 2) muscles

Answer 4

• can contract forcefully but fatigue quickly
• suited to high intensity short duration exercise

Question 5

Fast twitch (type 2a)

Answer 5

• white/ red (pink) in colour
• have both aerobic and anaerobic capabiltiies
  (less fatigue resistant but higher speed than type 1)

Question 6

Describe contraction of fast twitch (type 2a) muscles

Answer 6

rapid rate, can force repeatedly

Question 7

Fast twitch type 2b muscles

Answer 7

• bigger, white
• poor blood supply

Question 8

Describe contraction of fast twitch (type 2b) muscles

Answer 8

• can contract rapidly and forcefully for limited amount of time

Question 9

Distribution of muscle fibre types in bodies

Answer 9

• each muscle contains a mixture of the different fibre types
• proportions of fibre types are different between individuals and between different muscles of the individual

Question 10

Table (fill blank)
- no need “glycolytic” and “oxidative capacity”

Answer 10

photos

Question 11

Proportions of fibre types in sport.

Answer 11

• varies in different muscles of the same person
  fast thrower-> high proportion of fast twitch fibres in arms
  yet be a slow runner-> large percentage of slow twitch fibre in legs

Question 12

what determines the proportions of fibre types in a person?

Answer 12

genetic inheritance of fibres determines your speed or endurance potential