Animal Systems: Nervous System. Since you're reading this page, we figure you've got a nervous system.
If you were an insect you would also have a nervous system, but it would be a lot simpler. Even animals that don't think have simple nervous systems called nerve nets that help them move. Your nervous system is divided into two parts. Untitled. Untitled. Untitled. Skin Structure And Function: Definition, Diagrams Epidermis, Dermis Layers: Skin Diseases And Disorders. Diseases And Disorders Of The Skin Diseases and disorders of the skin can be classified under seven categories: 1.
Congenital: Exists at birth, may be inherited. 2. Skin as sensory organ review2008. Eye. The Eye [Back to Nervous System] In vertebrates vision begins with light entering the pupil.
The cornea and the lens focus and invert the light signal and project it to the back of the eye where the retina is located. Functions of the Eye. Meaning of Sensory function. What is the function of the sensory system? Six senses are commonly accepted as being accessible to humans and many animals: sight, hearing, taste, smell, touch and proprioception.
That last sense is the ability to know where the parts of the body are in relation to one another at all times. Each sensory organ has nerve receptors attached to it that are designed to transmit signals. For example, the eyes contain photoreceptors for light, the nose and tongue contain chemoreceptors for chemicals, and the skin contains mechanoreceptors for movement, pressure and related sensations. Sensory neurons operate on the all-or-nothing principle; they are either on or off.