Section A06 - Week 10.5

Section A06 - Week 10.5 - WEEK 10.5 Dan's Section BIEB 166...

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WEEK 10.5 Dan’s Section – BIEB 166 – Dr. Nieh Wed. 5 – 5:50 PM @ CSB 004 OH: Wed 3 – 4 PM @ York 3010 A Lecture 25: Olfactory Reception I. Olfactory mechanisms A) In general: Molecule binds to receptor, conformational change sends action potential to CNS B) Systems 1. Labeled line coding – One cell class per odor a) Advantages i. Very sensitive ii. Detects specific signal from noisy chemical background b) Disadvantages – Inefficient due to lack of recognition of complex smells Ex) Bats don’t bind NH 4 2. Across neuron pattern coding – Glomeruli bind odorants and process information Combinations of odorants illicit different responses in brain Ex) Honey bee antennal lobe II. Contact organs A) Tongue – molecules bind to receptors in taste buds 1. Senses: bitter, sweet, salty, sour, umami 2. Short stiff microvilli make a pore allowing small molecules into taste buds B) Vomeronasal Organs – Intermediate organ that contains receptors. Pure medium, pure substance contact through short, stiff microvilli as well
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This note was uploaded on 11/10/2010 for the course BIPN BIPN 102 taught by Professor Fortes during the Spring '09 term at UCSD.

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Section A06 - Week 10.5 - WEEK 10.5 Dan's Section BIEB 166...

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