nerves and sensitivity Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

central nervous system

A

brain
spinal cord
coordinates all of nervous responses such as moving or reflexes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

peripheral nervous system

A

contains all other nerves which send impulses to all effectors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

motor neurones

A

nucleus- genetic info
dendrite- connect to different neurones
cell body- main section (contains nucleus)
axon- long section in which signal is sent
myelin sheath- sections along neurone which wrap around axon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

reflexes

A

automated actions which do not involve brain

very fast and include sensory, relay and motor neurones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

reflex arc

A

movement of impulse from receptor to effector

stimulus-receptor-sensory-relay-motor-effector-response

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

synapse

A

gap between neurones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

cornea

A

curved transparent disc

most of focusing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

pupil

A

circular opening whose size is controlled by iris

coloured part of eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

iris

A

ring of muscles with hole in middle

iris controls how much light enters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

lens

A

soft, flexible and transparent

shape can be changed to fine tune the focusing of light onto the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

ciliary muscles

A

ring of muscles at edge of eye which circles lens
when contracts it gets fatter
when relaxes it gets thinner

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

suspensory ligaments

A

strong fibres which attach lens to ciliary muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

retina

A

contains light sensitive cells called rods and cones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

optic nerve

A

consists of many neurones which carry impulses from retina to brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

fovea

A

region of retina with greatest number of cones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

conjunctiva

A

mucous membrane that covers the eye to prevent infection

17
Q

iris reflex

A

dim light
radial muscles contract
pupil dilation
circular muscles relax

bright light
radial muscles relax
pupil contracts
get smaller