5.3 - sight

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Adequate stimulus

A stimulus can only be received by the correct receptor

What is the adequate stimulus for your eyes?

How do you call the minimum/maximum strength of a stimulus for a sense organ?

How do you call a signal from a sense organ to your brain?

1. Neuron
2. Stimulus
3. Adequate stimulus
4. Impulse

Types of nerve cells

Interneuron

Present in Central Nervous System (CNS)

Sensory neuron

Connected to sense organs

Motor neuron

Connected to muscles or glands

Which type of nerve is connected to light sensitive cells in your eyes?

1. Interneuron
2. Sensory neuron
3. Motor neuron

Unit 5: Perception, behaviour and regulation

§3  Sight

The outside of the eye

(frontal view)

The outside of the eye

(side view)

Eye movement

Muscles can move the eyeball in many directions

Attached to the sclera 

(white part)

The inside eye

3 outside layers:

sclera (outer)

choroid (middle, blood vessels)

retina (sensory cells)

Light comes in through pupil and lens

The inside eye

Most sensory cells in fovea

No sensory cells in blind spot (connection of eye with optic nerve)

Make §5.3

Assignment 3 (5 mins)

Pupillary reflex (dim light)

Pupillary reflex (bright light)

How the eyes work

What if your lens is not the right shape?

Near-sighted

Near objects clear

Far away object not clear

Lens too convex (bol)

Glasses with concave (holle) lenses

Far-sighted

Near objects not clear

Far away objects clear

Lens not convex enough

Glasses with convex lenses

The inside eye

Most sensory cells in fovea

No sensory cells in blind spot (connection of eye with optic nerve)