Senses And The Nervous System

Question 0

Stimulus

Answer 0

A stimulus is something that causes a response e.g. If you trip you put your arms out to catch yourself.

Question 1

Sensitivity

Answer 1

Detecting and responding to a stimulus.

Question 2

Lens

Answer 2

Focuses the light onto the retina.

Question 3

Iris

Answer 3

Controls the amount of light entering the eye.

Question 4

Cornea

Answer 4

Allows light through.

Question 5

Pupil

Answer 5

The hole that allows light through.

Question 6

Ciliary muscle

Answer 6

Changes the shape of the lens for focusing.

Question 7

Retina

Answer 7

Contains the light sensitive cells.

Question 8

Optic nerve

Answer 8

Carries messages to the brain.

Question 9

Nervous system

Answer 9

Brain, spinal cord and all the nerves.

Question 10

Sensory nerve

Answer 10

Sends a message to the brain from the sense organ. (Sends message to the brain).

Question 11

Motor nerve

Answer 11

Sends a message from the brain to a muscle. (Sends message away from the brain).

Question 12

Messages

Answer 12

Are sent along nerves as pulses of electricity.

Question 13

The eye contains

Answer 13

The cornea, iris, lens, pupil, retina, optic nerve and ciliary muscle.