Sensory System

Question 1

Response

Answer 1

An organisms reaction to a stimulus

Turning in radiator, stopping, sitting down, running

Question 2

Neuron

Answer 2

A nerve cell
Sensory neurons: signals to brain from senses
Motor neurons: signals from brain to muscles and glands

Question 3

Brain

Answer 3

Decides on correct response

Question 4

Stimulus

Answer 4

Anything that causes a organisms’ response.

Heat, cold, door, dog

Question 5

Lens

Answer 5

Focuses light to give clear image

Question 6

Pupil

Answer 6

Allows light in the eye

Question 7

Optic nerve

Answer 7

Carries messages to the brain

Question 8

Retina

Answer 8

Contains light-sensitive cells

Question 9

Iris

Answer 9

Controls light entering the eye

Question 10

Motor neurons

Answer 10

Messages from brain

Question 11

Sensory neurons

Answer 11

Messaged to brain

Question 12

Spinal cord

Answer 12

Carries messages to and from the brain

Question 13

The eye

Answer 13

Detects light and distinguishes colour

Made up of sclera, choroid, optic nerve

Question 14

Cornea

Answer 14

Focuses light

Question 15

Ciliary muscle

Answer 15

Changes shape of lens

Question 16

Dim light

Answer 16

Pupil is bigger

Question 17

Sclera

Answer 17

Outer coating that protects the eye

Question 18

Cornea

Answer 18

Transparent bump on the front of the eye

Bends light to produce image in retina

Question 19

Choroid

Answer 19

Darkly coloured, contains blood vessels and nerves