Neuromuacular System

Question 1

Type 1 a

Answer 1

Slow twitch adapted to lower intensity exercise. Slow contraction speed, high myoglobin and mitochondria and low fatigability.

Question 2

Type 2b

Answer 2

Fast twitch glycolytic.
High pc and glycogen stores.
Anaerobically powered.
Low myoglobin and mitochondria.

Question 3

Motor unit

Answer 3

A motor neurone and it’s fibres

Question 4

All or none law

Answer 4

Either all units contract or none do . If sequence of impulses is equal or more than threshold then they contract.

Question 5

Wave summation

Answer 5

Where there is repeated nerve stimulation with no time to rest so there is a smooth sustained contraction tetanic.

Question 6

Spatial summation

Answer 6

Strength of contraction changes by altering the number and size of muscle motor units. Some relax delaying fatigue.

Question 7

golgi tendon organs

Answer 7

Detect tension in muscle. Send inhibitory signals to brain telling antagonist to relax. Auto genie inhibition.

Question 8

Muscle spindles

Answer 8

Detect how far and fast muscle stretches.

Send exciting signals to CNS and that sends signal to muscle to contract triggers stretch reflex.