BIOC32H3 Lecture Notes - Lecture 10: Olfactory Receptor, Cochlear Duct, Vestibular Duct
Document Summary
Activated by a stimulus (physical energy) e. g light waves (vision), sound waves (hearing) Stimulus activates sensory receptors: converts stimulus to intracellular signal signal transduction changes in membrane potential (vm) *note: membrane potential (vm) also known as generator or receptor potential (same as graded potential) If threshold is reached, there will be a conduction of action potential to the cns. There are generally three types of sensory receptors (classified by structure): There are generally five types of sensory receptors (classified by the stimulus they"re most sensitive to): Chemoreceptors- respond to chemical stimuli that bind to receptors e. g taste, smell, o2, glucose, ph etc. Mechanoreceptors- respond to mechanical stress or mechanical strain e. g pressure (baroreceptors), vibration/gravity/cell stretch (osmoreceptors), acceleration (proprioceptors) Adequate stimulus- the form of energy to which that receptor is most responsive. *note: sensory receptors can respond to other forms of energy if stimulus intensity is high enough e. g photoreceptors responding to pressure.
