Physiology 2130 Lecture Notes - Lecture 7: Vestibular System, Sensory Neuron, Taste
25 May 2016
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Module 7: sensory systems | page 1 of 9. Human body has several sensory systems that allow it to detect external changes rapidly, which include: somatosensory (touch) system, the visual system, the auditory and vestibular system, the olfactory (smell) system, and the gustatory (taste) system. Transduction of environmental information how information from the external environment is turned into language the brain understands: action potentials. Environmental stimuli (energy) such as light, heat, touch, or sound must first be detected by sensory receptors which convert information into action potentials, for brain to know external occurrences: mechanical stimuli touch, pressure, vibration, proprioception, sound. Stretch in sensory receptors located in the skin open ion channels to cause depolarization of sensory neurons producing action potential: chemical stimuli taste, pain, odours. Binds to receptor to cause depolarization producing an action potential: electromagnetic stimuli light. Absorbed by photoreceptors in the eye (rods and cones in retina) produces action potential: other stimuli gravity, motion, acceleration, heat.
