Muscles And Health

Question 1

Atrophy

Answer 1

Reduction in size, tone, and power due to lack of use

Question 2

Hypertrophy

Answer 2

Exercise enduced increase In muscle mass

Question 3

Muscle twitch

Answer 3

• a single contraction that lasts a second
  -individual muscle fiber epithet twitches maximally or not at all
  -a muscle can vary depending on how many fibres there are

Question 4

Slow twitch fibres

Answer 4

• tend to be aerobic
  -contract slowly but resist fatigue
• many mitochondria
  -surrounded by dense capillary beds

Question 5

Fast twitch fibres

Answer 5

-Tend to be anaerobic
- adapted by rapid generation of power
- rich in glycogen
- fewer mitochondria and blood vessels
- fatigue quickly
- limit on exercise is due to depletion of muscle glycogen and buildup of lactate