Sensitivity andCoordination By Paula Crespo González
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.
The body has different receptors to receive different types of stimuli: ▪ Internal Receptors ▪ External Receptors
The body responds to any stimulus ▪ Muscular responses ▪ Glandular responses
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.
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.
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.
The body’s organ of the smell is the nose. The receptor of smell are in the pituitary, a structure inside the nostrils.
The body’s organ for the sense of taste is the tongue. The receptors of smell are in the taste buds.
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.
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.
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.