Somatic Nervous System (7/7)

Question 1

Somatic Nervous System

Answer 1

single neuron efferent system that controls skeletal muscle

Question 2

What do interneurons in spinal cord do?

Answer 2

interpret stimuli, fire somatic neurons (in ventral horn of spinal cord)

Question 3

Motor unit

Answer 3

single motor neuron and all muscle cell it controls (between 3 and 1000)

Question 4

What does the axon of somatic motor neuron do in neuromuscular junction?

Answer 4

contacts plasma membrane of skeletal muscle cell

Question 5

What does the action potential of neuromuscular junction do?

Answer 5

travels down axon and opens voltage-gated calcium channels

Question 6

What happens when calcium enters axon terminal?

Answer 6

it triggers release of acetylcholine

Question 7

Motor end plate

Answer 7

part of muscle cell membrane that receives signal with nicotinic acetylcholine receptors (Na channels)

Question 8

What happens when Na channels open?

Answer 8

sodium rushes into cell and causes graded potential