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A stimulus is anything that affects any of the body`s acivities.There are two types of stimuli: -Internal, they come from inside our bodies,like the feelings of hunger or thirst. External, these come from outside the body like the smell of a cake or the texture of a cloth
The eye is the body´s organ for the sense of sight.The eye is made up of the eyeball and protected by the eyebrows, eyelids and eyelashes: When light reaches the eyeball, it goes through the cornea.Then it goes through the pupil then passes through the lens which focuses the image on the retina .
The ear is the body´s organ for the sense of hearing.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 samll bones . -The inner ear. It is made up of the cochlea and the auditory nerve.
It has two parts -Brain it is inside the skull. It has three main parts: the cerebrum the cerebellum and the brain stem -Spinal cord it is a thick cord made up of many neurons that goes through the inside of the spine. It is protected by vertebrae.