PS5 - BIOAP 458, 2011 Name: Raw Score:_/92 PROBLEM SET 5...

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-1/6- BIOAP 458, 2011 Prof. Beyenbach Name: Raw Score:______/92 PROBLEM SET 5 Membrane voltage, Channels, Pumps and Carriers Percentile Score: (7.5% of final grade) 1) (16 pts) For the cell shown below consider the membrane permeability to protein (prot), organic molecules (org), and inorganic phosphate (PO 4 -3 ) to be negligible influencing the membrane voltage. a) (4 pts) Which ion provides the most negative intracellular electrical potential. What is this most negative intracellular voltage? b) (4 pts) Which ion provides the most positive intracellular electrical potential. c) (4 pts) the membrane voltage when the relative permeabilities are 0.6, 52, 8, and47 respectively for Na + , K + , Cl - and HCO 3 - . d) (4 pts) the membrane voltage when the relative permeabilities are 242, 52, 8, and 47 respectively for Na + , K + , Cl - and HCO 3 - .
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-2/6- 2) (10 pts) Shown below is an epithelial cell of the skin of a frog sitting in a fresh water pond. How low can the pond water [Na + ] drop before Na + stops entering the cell from the pond water? 3)
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This note was uploaded on 04/09/2011 for the course BIOAP 4580 taught by Professor Beyenbach,k. during the Spring '11 term at Cornell University (Engineering School).

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PS5 - BIOAP 458, 2011 Name: Raw Score:_/92 PROBLEM SET 5...

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