SENSE ORGANS: We interact with the environment using some organs like sense organs, the nervous system, and with movements using the skeleton and muscles. The sense organs detect outside information for evaluation and response. This is by stimulus on a specialized organs, which transmit impulses to the brain via nerves. 1.- Eyes (sight): is the ability to see the color, shape, size, details‌ Vision is achieved when eyes and brain work together to form pictures of the world around us. Vision begins when the light enters in the eye and it is controlled by the pupil, which dilates and contracts. The cornea and lens focus the light on the retina, where receptors convert it into nerve signals that pass to the brain through the optic nerve.
2.- Ears (hearing and balance): The vibrations are transmitted from the air to the ear, they enter through the auditory canal, they are transmitted across the eardrum and the auditory ossicles to the cochlea. In the cochlea there are cells that send the nerve impulses to the brain through the auditory nerve.
The inner ear has three semicircular canals which are responsible for the sense of balance, the movement and spatial orientation.