B1d Part 2 The Nervous System

Question 1

CNS

Answer 1

Central nervous system

Question 2

Dendrites

Answer 2

Branched endings

Question 3

Effector

Answer 3

E.g a muscle

Question 4

Neurone

Answer 4

A nerve cell

Question 5

Peripheral

Answer 5

Around the outside

Question 6

Receptor

Answer 6

E.g. Light sensitive cells

Question 7

Reflex

Answer 7

Reaction

Question 8

Sheath

Answer 8

Insulating later around the axon

Question 9

Spinal cord

Answer 9

Part of the CNS

Question 10

Synapse

Answer 10

Gap between 2 neurons

Electrical signals pass

A nerve impulse triggers the release of neurotransmitter molecules from the end of the neurone

The neurotransmitters diffuse across and bind with receptors on the next neurone - allowing the impulse to continue

Question 11

Stimulus

Answer 11

E.g. Pain
Heat
Light
Sound

Question 12

Transmitter substance

Answer 12

Found in synapse

Diffuses across the synapse

Binds with receptors

Question 13

Voluntary response

Answer 13

Under your control

Question 14

Nerve impulses …

Answer 14

(Electrical signal) pass along the axon if the neurone

Question 15

Adaptations of neurone

Answer 15

Long axon
Branched endings (dendrites)
Insulating sheath(speeds up nerve impulses)

Question 16

Spinal reflex arc

Answer 16

Stimulus
Receptor
Sensory neurone
Relay neurone on CNS
Motor neurone
Effector
Response

Question 17

Axon

Answer 17

Long part of neurone