The Nervous System

Question 0

What is a response?

Answer 0

An action taken when we detect a stimulus.

Question 1

What is a stimulus?

Answer 1

Anything in our surroundings that causes us to take action.

Question 2

What are stimuli detected by?

Answer 2

Sense organs

Question 3

Name the two parts of the nervous system

Answer 3

Central: brain, spinal cord
Peripheral: nerves that carry messages to cord and brain

Question 4

What are nerves?

Answer 4

Things that carry messages around the body by means of electric impulses

Question 5

What are nerves made up of?

Answer 5

Neurons

Question 6

Name two types of Neurons

Answer 6

Sensory: carry messages from sense organs to brain
Motor: carry messages away from brain and to muscles

Question 7

Give an example of responding to a stimulus

Answer 7

Pouring a cup of tea- our eyes detect when the cup is full

Question 8

What is the function of the retina?

Answer 8

Part of the eye that detects light

Question 9

Sclera?

Answer 9

Tough outer coating- protects the eye

Question 10

Choroid layer?

Answer 10

Dark layer- prevents light from reflecting in the eye

Question 11

Cornea?

Answer 11

Transparent part of sclera. Focuses light onto retina.

Question 12

Iris?

Answer 12

Coloured part of eye, controls amount of light entering eye

Question 13

Pupil?

Answer 13

Centre of iris, allows light into eye

Question 14

Lens?

Answer 14

Focuses light onto retina. Changes shape depending on distance of an object.

Question 15

Optic nerve?

Answer 15

Carries messages from eye to brain