The Senses

• Sight - eyes
• Hearing -ears
• Touch - skin
• Taste- mouth
• Smell- nose

• Bitter
• Sour
• Salt
• Sweet

Contain receptors which are specialised to respond to various stimuli (brain interprets info).

To brain which acts as the interpreting centre for received information

• Outer layer of cornea
• Protects against infection

Salt solution that holds front of eye (cornea) in shape.

Transparent section that allows light to enter.

• Curved, transparent and can change shape
• Focuses light on retina

• Black coloured to absorb light
• Let’s light light into back of eye

• Coloured part of eye
• Controls pupil size (amount of light entering eye)

Controls shape of lens, reflex action.

Contains large amounts of cones, provides colour to vision.

• Gel-like fluid that fills the back of eye
• Holds shape and gives support.

• Converts light into nerve impulses
• Contains cones and rods.

• Prevents internal reflection of light inside eye
• Has nourishing blood vessels

Tough protective outer layer of eye.

No rods or cones here

Carries impulses from rods and cones in the retina to the brain.

Conjunctiva

Aqueous humour

Cornea

Lens

Pupil

Iris

The Irish controls the pupil size which controls the amount of light entering as the Phil absorbs light.

Ciliary muscle

Reflex action

Fovea

Vitreous humour (gives shape and support)

Retina

Retina

Choroid

Choroid

Sclera

Blind spot

Optic nerve