Bio 317 Review Session 1

Bio 317 Review Session 1 - Bio 317 Review Session 1 TA:...

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Bio 317 Review Session 1 TA: Erin Rasco
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1. Describe three different mechanisms of cell signaling base on time scales.
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2. When we record an electroencephalogram (EEG), what part of body do we record from?
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3. In a hypothetical cell we find the following distributions of ions. You are told that the cell is in electrochemical and osmotic equilibrium. Both sodium and chloride are freely membrane permeable. Potassium and Bromide are membrane impermeable. Fill in the blanks and for each step explain how you did it. 102mM 102mM 100mM Electrical neutrality [Na+] i + [K+] i = [Cl-] i + [Br-] i 100mM + 12mM = 10mM + [Br-] i [Na+] o + [K+] o = [Cl-] o + [Br-] o 10mM + [K+] o = [Cl-] o + 12mM Osmotic balance [Na+] i + [K+] i + [Cl-] i + [Br-] i = [Na+] o + [K+] o + [Cl-] o + [Br-] o = 224mM 10mM + [K+] o + [Cl-] o + 12mM = 224mM
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Are all of the ions membrane-permeable?
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Bio 317 Review Session 1 - Bio 317 Review Session 1 TA:...

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