The document discusses the human senses and how the body responds to stimuli. It defines stimuli as anything perceived by the senses and notes they can originate internally or externally. The body has receptors for different stimuli and responds through muscular or glandular responses. Each sense is then described, including the organs and processes involved for sight, smell, taste, touch, and hearing. Neurons are introduced as the basic cells of the nervous system, and the skeleton and musculature are listed as topics to be further explained.

1. SENSITIVITY AND
COORDINATION
By Lucia Villacorta and
Claudia Romero.

2. STIMULI
A stimulus is anything you see, touch,
taste ,hear and smell.
Stimuli can be internal or external.
Internal stimuli :come from inside our
bodies.
External stimuli :come from outside
our bodies.
The body has different receptors:
Internal receptors.
External receptors.

3. External stimuli
External receptors
Internal receptors
Internal stimuli

4. RESPONSES
A response is the body’s answer to a
stimulus.
There are two types of responses,
muscular and glandular.

5. SIGHT
1.
2.
3.
4.
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.

7. 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
buds.
The skin is the organ of touch. It is
made up of three layers: epidermis,
dermis and hypodermis.

8. HEARING
The ear is the organ of hearing .It has
three parts:
The outer ear.
The middle ear .
The inner ear.
1. The outer ear receives sounds.
2. The middle ear changes sounds into
vibration .
3. The inner ear changes vibrations
into nerve impulses that go to the
brain.

9. NEURONS
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.

10. THE
SKELETON

11. THE MUSCULATURE