Nerves

Sensory Receptors 

• A sensory receptor is a cell in which a change in the internal or external environment produces a nerve impulse or action potential. Some receptors are scattered in appropriate body tissues, such as the skin or the lining of the airways. Others are concentrated in organs such as the eye or ear. All receptor cells are transducers , in which one form of energy, the stimulus energy, is converted into another form, electrical energy.
• Receptors in mammals are adapted to respond to different aspects of the environment, such as: light intensity and wavelength, sound, touch and pressure, temperature and chemicals.

Neurones (nerve cells)

• Cells that are specialised to transmit the electrical signals of nerve impulses very rapidly from one part of the body to another.
• Sensory Neurones: transmit nerve impulses from a receptor to the…