ANATOMY

Detailed explanation-1: -All sensory signals begin as receptor potentials. These potentials lead to a release of a neurotransmitter that excites its corresponding nerve to send information to the brain.

Detailed explanation-2: -They react to pressure, touch, pain, and temperature in the skin, and also include most receptors of the special senses (hearing, vision, equilibrium, smell, and taste). Interoceptors respond to stimuli inside the body, including from blood vessels and internal viscera.

Detailed explanation-3: -Reception. The first step in sensation is reception., which is the activation of sensory receptors by stimuli such as mechanical stimuli (being bent or squished, for example), chemicals, or temperature.

Detailed explanation-4: -When a stimulus is detected by a sensory receptor, it can elicit a reflex via stimulus transduction. An internal stimulus is often the first component of a homeostatic control system. External stimuli are capable of producing systemic responses throughout the body, as in the fight-or-flight response.

Detailed explanation-5: -Nociceptors are sensory receptors that detect signals from damaged tissue or the threat of damage and indirectly also respond to chemicals released from the damaged tissue.