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001_Bild2MidKey1 - BILD 2 Winter Quarter 2007 1 Name_KEY...

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BILD 2 Name ____ KEY ________ Winter Quarter, 2007 1 BILD 2 FIRST MIDTERM EXAM Winter Quarter, 2007 WRITE YOUR NAME ON ALL 5 PAGES. ANSWER ALL 9 QUESTIONS (100 POINTS). CONFINE YOUR ANSWERS TO THE SPACE ALLOWED. (Answer only the exact questions asked, but provide all the detail possible in those cases.) __ Aimee _ 1. ( 5 points) __ Jon Q _ 2. (10 points) _ Nhan __ 3. (10 points) _ Amanda 4. (10 points) __ Ashley _ 5. (10 points) __ Boris _ 6. (10 points) _ Rachel _ 7. (15 points) __ Ricky __ 8. (15 points) Sarah/Francisco 9. (15 points) ________ 100 total TOTAL POINTS _________ By signing this waiver I give permission for this exam to be left for me to pick up in the boxes outside the elevators on the third floor of Pacific Hall (if I miss the exam return at the end of lecture). I realize that this procedure may expose my grade to public scrutiny. If I do not sign this waiver, I acknowledge that my exam will be available for pick up only between 1:00 and 3:00 PM Monday-Friday in 3140B Pacific Hall. _____________________________________________________________ Signature Date
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BILD 2 Name ____ KEY ________ Winter Quarter, 2007 2 1. (5 points) How do the functions of neurons differ from glia? Neurons are cells in the nervous system that are electrically excitable (fire APS) and form synapses on other neurons or effector cells. Glia (10-fold more numerous) are cells in the nervous system that provide insulation and nutritive support for neurons, and can even participate in cell-cell signaling, but are not though to be electrically excitable. 2. (10 points) Briefly define or identify each of the following: Acetylcholine – Neurotransmitter at the NMJ (and in the autonomic nervous system & CNS) Cerebellum – Structure at the rear (and base) of the brain coordinting movement. Corpus callosum – Bundle of myelinated nerve fibers (axons) connecting the two hemispheres (left & right halves) of the brain (traverses the midline) Ionotropic receptors – Membrane poteins that bind transmitters and open to reveal an (internal) ion channel (i.e. , a ligand-gated ion channel). Temporal summation – PSPs summating over time at the same synapse (produced by rapid repetive firing other the presynaptic terminal). 3. (10 points) Diagram the action potential and label the axes of the graph, i.e. indicate the duration and amplitude. How would the AP change in shape and size if Na + channels didn’t in activate? How would the AP change if extracellular Na + was replaced by K + ? Why?
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