Name the three structures of receptors, describe each, and give a specific example of each.
1. FREE NERVE ENDINGS:
-lack any structural specializations that can be seen under a light microscope
-EXAMPLES: receptors for pain, thermal, tickle, itch, and some touch sensations
2. ENCAPSULATED NERVE ENDINGS:
-dendrites are enclosed in a connective tissue capsule that has a distinctive microscopic structure
-different types of capsules enhance the sensitivity or specificity of the receptor
-EXAMPLES: pressure, vibration, and visceral sensations
3. SEPARATE CELLS:
-sensory receptors for some special senses are specialized
-hair cells for equilibrium in the inner ear
-gustatory receptor cells in taste buds
-photoreceptors in the retina of the eye for vision
Name the three locations of receptors, describe each, and give a specific example of each.
-near external surfaces
-deals with somatic and special senses
-EXAMPLE: hearing, vision, smell, taste, touch, pressure, vibration, temperature, and pain
-deals with visceral sensations
-nerve impulses conducted are not consciously perceived
-provide information about body position, muscle length, and tension, and the position and movement of joints
-located in muscles, tendons, joints, and the inner ear
NAME AT LEAST FOUR RECEPTORS NAMED FOR THE STIMULI THEY DETECT, DESCRIBE EACH STIMULUS, AND GIVE A SPECIFIC EXAMPLE OF EACH.
1. MECHANORECEPTORS: sensitive to mechanical stimuli such as the deformation, stretching or bending of cells
-provide sensations of touch, pressure, vibration, proprioception, and hearing/equilibrium.
-monitor stretching of blood vessels and internal organs
2.THERMORECEPTORS: detect changes in temperature
3. NOCICEPTOR: respond to painful stimuli resulting from physical or chemical damage to tissue