BME201_2010_HWK1 - NAME:_______________________________ 1...

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Unformatted text preview: NAME:_______________________________ 1 125:201 INTRODUCTION TO BIOMEDICAL ENGINEERING, Fall 2010 Bioelectrical Phenomena Instructor: Nada Boustany HOMEWORK #1- Due Thursday Nov. 18 Problem 1- Indicate if the following statements are True or False. 1- An action potential is generated by changing the bulk concentrations of sodium inside and outside the cell. 2- A cell membrane at rest with the following ionic concentrations has a resting potential rest = -85 mV. inside outside Na + 150 mM 150 mM K + 5 mM 5 mM Cl- 155 mM 155 mM 3- The sino-atrial node is composed of cells that can rhythmically self-generate their own action potential. 4- An action potential is primarily due to the movement of K + (potassium) through the K + leak channels. Problem 2: What do you expect will happen to the membrane potential of neurons during a stroke? Please explain your answer. NAME:_______________________________ 2 Problem 3: A magnified section of a cell membrane, which is permeable to sodium, is shown in Figure 3 . The thickness of the membrane is = 5 nm. The concentrations of sodium are [Na + ] out = 150mM outside and [Na...
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BME201_2010_HWK1 - NAME:_______________________________ 1...

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