Fast And Slow Twitch

Question 0

How are slow twitch fibres adapted to aerobic respiration?

Answer 0

Large store of myoglobin (red, stored O2)
Rich supply of glycogen (source of metabolic energy)
Rich supply of blood vessels (O2 and glucose)
Numerous mitochondria (ATP)

Question 1

Slow twitch …

Answer 1

Contract more slowly
Less powerful contractions over a longer period
Adapted to endurance work(marathons)
More common in constantly contracting muscles(calf)
Adapted to aerobic resp

Question 2

Fast twitch fibres…

Answer 2

Contract more rapidly
More powerful contractions over a shorter period
Adapted to intense exercise(weights)
More common in muscles needing to do bursts of intense activity (biceps)
Anaerobic respiration

Question 3

How are fast twitch muscle fibres adapted

Answer 3

Thicker, more myosin filaments
Higher conc. of enzymes involved in anaerobic resp.
Store of phosphocreatine ( molecule that rapidly generates ATP from ADP in anaerobic conditions)