Key Terms — Nervous System

Question 1

Neurones

Answer 1

Carry electrical impulses from a point to another

Question 2

Synapse

Answer 2

Gap between neurones

Question 3

Neurotransmitters

Answer 3

To pass electrical impulses chemically across a synapse

Question 4

Axon

Question 5

Myelin sheath

Answer 5

Insulate impulse to speed up

Question 6

Central nervous system

Answer 6

Brain and spinal cord

Question 7

Stimulus

Question 8

Receptor

Answer 8

Eyes (light)
Nose (chemical)
Ears (sound)
Pain, pressure (kinetic, chemical)
Temp (thermal)

Question 9

Sensory neurone

Question 10

Relay neurone

Question 11

Motor neurone

Question 12

Effectors

Question 13

Reflex arc

Answer 13

Nerve pathway that underlies our unconscious reflexes
Rapid, x involve brains, protects us from danger

Question 14

Cornea

Answer 14

Refracts light in the same amount

Question 15

Aqueous humour

Question 16

Iris

Answer 16

Control pupil size

Question 17

Pupil

Question 18

Lens

Answer 18

Adjust thickness to bend light at different amounts to focus light on the retina

Question 19

Suspensory ligament

Answer 19

Fibre

Question 20

Ciliary muscle

Question 21

Retina

Question 22

Cone cells

Answer 22

More letters = more light = bright light
Blue red green
Only in fovea

Question 23

Rod cells

Answer 23

In dim light
Only black and white
All over the retina

Question 24

Fovea

Answer 24

Point where light should be refaced to

Question 25

Blind spot

Answer 25

X images formed
X cone nor rod cells

Question 26

Choroid

Question 27

Sclera

Question 28

Optic nerve

Answer 28

Carry impulses

Question 29

Circular muscles

Answer 29

Not CIRCULATORY

Question 30

Radial muscle