Sense: In biology and medicine, the faculty of sensory reception. The ability to convey specific types of external or internal stimuli to the brain and perceive them. Sensory reception occurs through a process known as transduction in which stimuli are converted into nerve impulses which are relayed to the brain.
This process may involve the special senses -- hearing, sight, smell, taste, and touch -- in which the corresponding sensory receptors are concentrated in the ear, eye, olfactory (smell) apparatus, taste buds, and skin.
The skin is rich in sensory receptors that convey the sensations not only of touch but also of heat and cold, pressure, and pain. Other sensory receptors are situated in internal organs such as the throat, stomach and heart.