PSYC 2012 Lecture Notes - Lecture 23: Endocrine Disease, Aroma Compound, Olfactory Mucosa
Document Summary
Goal: to determine how our nervous system produces voluntary movement and to define cognition and. Week 10: the chemical senses and the sensorimotor system. Chemicals enter the mouth and are dissolved in saliva. Chemicals dissolved in saliva access taste receptors located in taste buds found primarily on the tongue. The mouth also has receptors for touch. Chemicals bind to receptors or enter a channel on taste bud receptor cells. Binding to receptors or movement through channel opens na+ channels or closes k+ channels. Opening of na+ channels or closing of k+ channels depolarizes receptor cells. Depolarization results in release of neurotransmitter onto sensory neurons. Sour: ion channel lets h+ ions into cell, which closes k+ channel. Sweet: surface receptors bind to glucose and similar sugars and opens a na+ channel. Bitter: binds to a wide range of aromatic compounds, which opens a na+ channel. Salty: ion channel lets na+ enter cell.
