9.5 Mammalian Nervous System

Question 1

Define sensory neuron:

Answer 1

A nerve cell that carries information from a receptor to the central nervous system

Question 2

Define motor neuron:

Answer 2

A nerve cell within the central nervous system which relays information between sensory and motor output

Question 3

Define polarised

Answer 3

Condition where there is an unequal distribution of charges between two points (e.g inside and outside cell membrane)

Question 4

Threshold potential

Answer 4

The minimum stimulation that’s required to stimulate a nerve impulse

Question 5

Define a neurotransmitter:

Answer 5

Chemical that passes from one area to another in order to bring about a change

Question 6

Neurotransmitter Ex:

Answer 6

Chemical passing from one axonic end of one neuron, to the dendritic end of the adjoining neuron

Question 7

Neuromuscular junction:

Answer 7

The junction between the nerve and muscle cells

Question 8

Define the CNS

Answer 8

Mass of neuron tissue, comprising of the brain and spinal cord (verte).

Question 9

CNS purpose

Answer 9

Coordinate the activities of animals

Question 10

Define PNS:

Answer 10

Nerve system between effectors, receptors and CNS system.

Question 11

Define 2 parts of the PNS:

Answer 11

Somatic (outer body tube), and visceral (inner body tube)

Question 12

Spinal cord:

Answer 12

Part of the vertebrate central nervous system within the backbone

Question 13

Define proprioceptor:

Answer 13

Sensory receptor which receives stimuli from within the body.

Question 14

What do proprioceptors control?

Answer 14

Response to position and movement

Question 15

Direct chemoreceptor:

Answer 15

Sensory receptor able to detect chemical stimuli with which it is in direct contact

Question 16

Distance chemoreceptor

Answer 16

Sensory receptor able to detect chemical chemical stimuli with which it is direct contact