Unit 2 sensitivity and coordination teresa and laura s
Stimulus is anything you see,hear,touch,
smell or taste . Can be :
• Internal stimuli.
• External stimuli.
The body has different receptors .
• Internal receptors
• External receptors
A respose is the body’s answer to a
stimulus. There are two types:
• Muscular responses
• Glandular responses
The eye is the organ of sight. Is made up of
the eyeball and protected by the
eyebrows, eyelids and eyelashes.
1. First light goes through the
2. Then light passes through the
3. After that light passes
through the lens.
4. Finally information in the
retina travels to the brain
through the optic nerve .
The nose is the organ of smell.the
receptors of smell are in the pituitary
gland inside the nostrils.
The parts are nostrils and
The ear is the organ of hearing it has
• The outer ear includes the ear and ear
• The middle ear includes the eardrum
and the small bones.
• The inner ear includes the cochlea and
the auditory nerve.
1.The outer ear receives sounds.
2.The middle ear changes sounds into
3.The inner ear changes vibrations into
into nerve impulses that go to the
Ear,ear canal ,eardrum,small
The skin is the organ of touch. It is made
up of three layers.
The tongue is the organ of taste.
The receptors of taste are in the taste
The nervous system is made up of nerve
centres and nerves.
Nerves centres interpret the information and
develop responses, forming the central nervous
The central nervous system has two parts:
The brain inside the skull. It is made up of the
cerebrum, the cerebellum and the brain stem.
The peripheral nervous system is made up of:
Both the central and peripheral nervous
systems are made up of specialised cells
They are made up of a cell body,
dendrites and axons.
The brain produces a response in the
case of voluntay movements.
The spinal cord produces a
response in the case of