2. A stimulus is anything that affects any of the
body’s activities. There are two types of
stimuli:
Internal
External
A response is the body’s answer to a stimulus.
3. The body has different receptors to receive different
types of stimuli:
▪ Internal Receptors
▪ External Receptors
4. The body responds to any stimulus
▪ Muscular responses
▪ Glandular responses
5.
6. The organ of the sense is the eye. The main part of
the eye is the eyeball.
Parts of the eye: Cornea, Pupil, Iris, Lens, Retina and
the Optic Nerve.
7. The ear is the body’s organ for the sense of hearning. The ear
has three parts:
▪ The Outer Ear: It is made up of the ear and outer
auditory canal.
▪ The Middle Ear: It is made up of the eardrum and a chain
of small bones.
▪ The Inner Ear: It is made up of the cochlea and the
auditory nerve.
8. The body’s for the sense of touch is the skin
Epidermis: It is the outer layer.
Dermis: It is under the epidermis.
Hypodermis: It is under the dermis.
9. The body’s organ of the smell is the nose. The
receptor of smell are in the pituitary, a
structure inside the nostrils.
10. The body’s organ for the sense of taste is the
tongue. The receptors of smell are in the
taste buds.
11.
12. Brain: It is inside the skull.
Spinal Cord: It is a thick cord made up of
many neurons that goes through the inside of
the spine.
13. Sensory nerves: They transmit information from the
sensory organs and internal organs to the central
nervous system.
Motor nerves: They transmit responses from the
central nervous system to the muscles and glands of
our bodies.
14. Neurons are the cell that belong to the nervous
system. They have a star-like shape made up of
three parts: a cell body, dentrites and axons.
