Lecture+notes+09 - Copy

Lecture+notes+09 - Copy - Lecture Notes Bio 109 Fall 2010...

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Lecture Notes Bio 109, Fall 2010, Dr. Catherine Loudon Lecture 9 – 10/13/10 – Nervous system 1) Announcements a) No questions from Ch. 9 will be on Test 1 (there is one question from Ch. 9 on quiz 3) b) Reminder about Test 1 on Friday 2) Ion concentrations affect neuron excitability (e.g. Fig. 8-19) a) Example of [K+] 3) Clicker question: When the blood [K+] is lower than normal, would you predict that a neuron would (answer counts) a) A. be more excitable (more likely to fire AP) b) B. be less excitable (less likely to fire AP) [correct answer] c) C. of normal excitability 4) Synapses a) Synapse is region where neuron meets target cell b) Electrical (gap junction between cells) (Fig. 6-1) i) Fast – direct transmission of electrical disturbance from one cell to another ii) Bidirectional c) Most synapses are chemical i) Unidirectional transmission ii) Neurotransmitter d) Presynaptic cell – events at axon terminal (Fig. 8-21) i) voltage-gated Ca++ channels, exocytosis e) Postsynaptic cell – binding of neurotransmitters
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Lecture+notes+09 - Copy - Lecture Notes Bio 109 Fall 2010...

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