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Unformatted text preview: 1 125:201 INTRODUCTION TO BIOMEDICAL ENGINEERING, Fall 2010 Bioelectrical Phenomena and Bioinstrumentation Instructor: Nada Boustany HOMEWORK #3- Due Thursday Dec. 9 REMINDER: EXAM #3 is on MONDAY DEC. 13, 2010, 8:40am-10am. RC circuit model of the membrane. Problem 1: In class, we wrote an expression for the voltage across the membrane at rest. In this problem you are asked to derive this expression by showing all the details leading to the answer. a- Please draw a circuit model of the cell membrane at rest (please ignore the currents through the Na + /K + ATP pumps). b- Please show (i.e. please show all the details leading to the answer) that the voltage across the membrane is + + + + + + + + + + = Cl K Na Cl Cl K K Na Na rest R R R R V R V R V V 1 1 1 c- How will your circuit model in Part a change if it were to include voltage gated channels that get briefly activated during an action potential? Problem 2 (taken from Exam 3, 2004): A cell membrane is modeled as the RC circuit shown in Figure 2 . The membrane receives a short impulse of current, and the membrane potential is then observed as a...
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- Fall '10