ocr: TOUCH HE. SKIN is thel largest sense organ: it covers - - - - the whole body. Human skin can detect five ditlerent sensations: touch, heat, cold, pressure, and pain. These sensations are felt when nerve impulses from the skin are received by the brain. Receptors near the surface of the skin detect touch. There are many ofthem in sensitive areas like the fingertips and lips. Other receptors near the surface detect heat, cold, - and pain. Receptors for pressure lie deeperin the skin. The sensation of being tickledis believed to be caused by the stimulation ofthe receptors for pain and touch at t ...