LECTURE 13

Question 1

What is a neuron

Answer 1

A basic unit of innervation. Neurons have branches allowing connection to other neurons

Question 2

What is another name for an electrical signal

Answer 2

Action potential

Question 3

What chemical is released into the muscle and how does this effect muscle movement

Answer 3

Aceytlcholine; when released causes muscle contraction

Question 4

Which filaments do muscle fibres contain

Answer 4

Actin, myosin

Question 5

Alpha motor neurons

Answer 5

Innervate skeletal muscle; cause muscle contractions

Question 6

Corticospinal tract

Answer 6

Connection between the cortex and the spine

Question 7

What percentage of neurons cross the midline and what percentage do not

Answer 7

75% cross the midline - these control distal muscles.
25% stay on the ipsilateral side of the body and control axial muscles.

Question 8

Afferent nerve

Answer 8

Arrival information that travels to the brain

Question 9

Efferent nerve

Answer 9

Signals that exit the brain to travel to the periphery

Question 10

Muscle spindles

Answer 10

Give feedback about the length of muscle stretch
Send signals via neurons to spine and up.
Spindles fire when the muscle is stretched

Question 11

Role of a muscle spindle during a lift

Answer 11

Spindles detect muscle stretch and cause contraction to resist the stretch.
Slow squat = small response
Fast squat = large response

Question 12

Role of Golgi Tendon Organs in fitness training

Answer 12

Senses the tendon stretch and limits the force we can use. Gradual weight increase allows GTO to adapt.