A&P- Neuromuscular system definitions

Question 1

Define Fast glycolytic (type IIx) muscle fibres

Answer 1

Muscle fibres that produce the highest force and speed of contraction via anaerobic respiration

Question 2

Define Fast oxidative glycolytic (type IIa) muscle fibres

Answer 2

Muscle fibres that produce a high force and speed of contraction

Question 3

Define Slow twitch (type I) muscle fibres

Answer 3

Muscle fibres that produce a low force and speed of contraction via aerobic respiration

Question 4

Define Motor unit

Answer 4

Made up of a motor neuron and its muscle fibres

Question 5

Define The All or none law

Answer 5

Impulses arriving at the neuron must reach a threshold level. If they do all of the muscle fibres in that motor unit will contract, if they don’t, none will contract

Question 6

Define Golgi tendon organs

Answer 6

Proprioceptors that detect high levels of tension in a muscle and initiate autogenic inhibition, overriding the stretch reflex, causing the muscle to relax

Question 7

Define Muscle spindles

Answer 7

Proprioceptors that detect how far or fast a muscle is stretched and initiate a stretch reflex to prevent over stretching

Question 8

Define Spatial summation

Answer 8

The addition of impulses received at the same time, but at different places on the neuron

Question 9

Define Wave summation

Answer 9

Repeated nerve impulses, not allowing the muscle fibres to fully relax, resulting in a tetanic contraction

Question 10

Define Tetanic contraction

Answer 10

A smooth sustained muscle contraction