By Lucia Villacorta and
A stimulus is anything you see, touch,
taste ,hear and smell.
Stimuli can be internal or external.
Internal stimuli :come from inside our
External stimuli :come from outside
The body has different receptors:
A response is the body’s answer to a
There are two types of responses,
muscular and glandular.
The eye is the organ of sight .Is made up
of the eyeball and protected by the
eyebrows , eyelids and eyelashes.
Fist light passes to the cornea.
Light passes through the pupil .
Light passes through the lens which
focuses the image on the retina.
The information in the retina travels to the
brain through the optic nerve.
SMEL, TASTE and TOUCH
The nose is the organ of smell. The
receptors of smell are in the pituitary
gland, inside the nostrils.
The tongue is the organ of taste. The
receptor of taste are in the taste
The skin is the organ of touch. It is
made up of three layers: epidermis,
dermis and hypodermis.
The ear is the organ of hearing .It has
The outer ear.
The middle ear .
The inner ear.
1. The outer ear receives sounds.
2. The middle ear changes sounds into
3. The inner ear changes vibrations
into nerve impulses that go to the
Both the central and peripheral
nervous system are made up of
specialised cells called neurons.
They are made up of a cell body,
dendrites and axons.