Muscles And Muscle Action.

Question 0

Isometric contraction

Answer 0

Muscle stays the same length and nothing moves e.g. Wall sit (used less frequently)

Question 1

Isotonic contractions

Answer 1

Muscles change length and so something moves e.g. Bicep curl.

Question 2

Fast twitch fibres

Answer 2

Used in explosive activities
Contract quickly
Produce powerful action
Limited oxygen supply
White in colour
E.g. Speed event and throwing.

Question 3

Slow twitch fibres

Answer 3

Used in endurance activities
Contract slowly
Long lasting
Good oxygen supply
Red in colour
E.g. Long distance running and swimming

Question 4

Immediate effect of excercise on muscles

Answer 4

Requirement for extra fuel (glucose and oxygen)
Lactic acid produced if not enough oxygen
Muscle stiffness, soreness and cramp
Muscles start to fatigue, can no longer perform movement.

Question 5

Effects of regular training on muscles

Answer 5

Can cope better with lactic acid, takes longer to build up.
Increased hyper trophy
Increase strength
Increase power
Increase muscle endurance
More toned muscle appearance
Better posture
Reduce risk of injury

Question 6

Potential for injuries

Answer 6

Sprains
Strains
Muscle atrophy
Minor injuries e.g. Cuts and grazes

Question 7

Treatment for muscular injury

Answer 7

Rest- rest the injured part to reduce further injury.
Ice- apply ice or cold compress to reduce blood flow, pain and swelling.
Compression- compress the injury to reduce bleeding and swelling.
Elevation- elevate the injured part to reduce, bleeding, swelling and throbbing.