BIOL 14108 Chapter Notes - Chapter 10: Rhodopsin, Semicircular Canals, Enkephalin
26 Jan 2016
School
Department
Course
Professor
Document Summary
There are 5 different types according to their sensation: chemo-receptors: sense chemicals, pain receptors: sense tissue, thermo-receptors: sense any change in temperature, mechano-receptors: pressure/movement, photo-receptors: change in light. A sensation is awareness that occurs when the brain receives sensory impulse. A perception is when the brain interprets the input. The ability of the nervous system to become less responsive to a maintained stimulus is called sensory adaptation. Receptors with skin, muscle, joints, viscera are all called somatic senses. Derived from three receptors: free nerve endings: found in epithelial. Associated with itching: tactile corpuscles: abundant in hairless areas of skin, lips, fingertips, palms, soles and nipples, lamellate corpuscles: resembles an onion. Receptors include 2 groups of free end nerves: warm receptors and cold receptors. Warm receptors include any temperature above 25 degree celsius and below 45 degree celsius. Cold receptors include any temperature between 10 and 20 (degree celsius) Nervous tissue in brain lacks pain receptors.
