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Physiology (final).docx

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Department
Physiology
Course
Physiology 2130
Professor
Prof
Semester
Fall

Description
Smell and tastechemoreceptionOlfactory pathway o neural receptors o synapse with secondary neurons in the olfactory bulb OlfactorybulbSecondarysensory neurons Bone Olfactory sensoryneuronsOlfactoryepitheliumOlfactory neurons are constantly being replaced by basal cell layers stem cellsOlfactory transduction o 1 odorant molecules dissolved by mucus o 2 dissolved molecules bind to the odorant receptors at the primary olfactory neuron o 3 opening of Na channelso 4 generation of action potentialso 5 opening of Ca channels o 6 release of neurotransmitters to secondary olfactory neuron Hundreds of odor receptors combination of signals from different sensory neurons create the perception of smellSmell Primary olfactory neuronsolfactory bulbolfactory cortexlimbic systemLimbic system and smell o memory o emotionsTermination of olfactory response o 1 odorant molecules diffuse awayo 2 enzymes in the mucus break these molecules downo 3 desensitization of the receptor o 4 adaptation Papilla are most sensitive to one basic taste
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