2. STIMULI
A stimulus is anything you see, hear, touch, smell or taste.
Stimuli can be internal or external.
The body has different receptors:
Internal receptors.
External receptors.
RESPONSES
A response is the body’s answer to a stimulus.
There are two types of responses, muscular and glandular
responses.
3. SIGHT
The eye is the organ of sight.It is made up of the
eyeball and protected by the eyebrows,the eyelids
and eyelashes.
After that light
passes through
the lens Retina
First light goes
through the cornea
Finally the
information in
the retina
Then light travels to the
passes brain through
through the the optic
pupil Iris nerve.
4. The nose is the organ of smell. The receptors of smell are in the
pituitary gland ,inside the nostrils.
pituitary
nostrils
5. The ear is the organ of hearing.it has three
parts :the outer ear ,the middle ear ,and the
inner ear.
The outer ear includes the ear and ear canal.
The middle ear includes the eadrum and the
small bones.
The inner ear includes the cochlea and the
auditory nerve.
6. Auditory
eardrum nerve
cochlea
ear
Ear canal
Small bones
7. The skin is the The tongue is the
organ of touch.it is organ of taste .The
made up of three receptors of taste
layers. are in the taste
epidermis
buds.There are
taste buds all
around the tongue.
dermis
Taste
hypodermis buds
8. Is made up of nerve centres and nerves.
Nerve centres interpret the information and develop
responses,forming the central nervous system.
The central nervous system has two parts:
The brain is inside the skull.It is made up of the
cerebrum, cerebellum and the brain stem.
The spine cord is made up of many neurons.It is protected by
vertebrae.
The peripheral nervous system is made up of:
Sensory nerves
Motor nerves.
10. Both the central and peripheral nervous systems are made up
of specialised cells called neurons.
The are made up of a cell body, dendrites and axons.
11. VOLUNTARY INVOLUNTARY
MOVEMENTS MOVEMENTS
The brain produces a The spinal cord produces a
response in the case of response in the case of
voluntary movements . involuntary movements.
