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Anatomy and Physiology

C +40mV - 0- -40mV -60mV - А DE В 1 4 Stimulus Time (msec) Membrane potential

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

Based on the graph, the threshold voltage appears to be approximately. (Base your answer to this question on the graph below depicting an action potential.)

+60 mV.

+30 mV.

0 mV.

−30 mV.

−60 mV.

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Can you help me with this question, please?
What property is responsible for the initial ramp of the membrane potential at the onset of the current pulse?A: Membrane capacitanceB: Membrane resistance explain your choice
Conditions: [Na+] outside = .3 mM [Na+] inside the presynaptic cell = .01 mM [dopamine] inside = .5 mM [dopamine] outside = .001 mM ΔGinward = RT ln [X] inside/[X] outside + z F Vm F = 23,000 cal/mol V R = 1.987 cal/ mol K Membrane potential is .07 V Temperature is 273 K Using the attachment and information above, please answer the following questions below: ( Is the concentration of dopamine higher on the inside or the outside of the presynaptic cell? SHOW your work. 2.) Would the movement of dopamine INTO the presynaptic cell be active or passive? SHOW your work.
E. ACTION POTENTIAL Describe what happens in each phases of action potential and explain the following events in the illustration below. 3. Peak action potential +30 Repolarization Threshold of excitation -55 2 1 Hyperpolarization -70 Resting potential 4 Time [Enter description here] Membrane potential (mV)
Let's say you have neurons in a petrie dish bath in a solution in which the extracellular K+ concentration is 5 mM and the intracellular concentration is 100 mM. Now you flood the dish with a solution containing K+ at 115 mM. What will be the Equilibrium Potential now for the cell (rounded up to the next integer)? O O mv O 4 mv O 70 mv O -70 mv
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Conditions: [Na+] outside = .3 mM [Na+] inside the presynaptic cell = .01 mM [dopamine] inside = .5 mM [dopamine] outside = .001 mM ΔGinward = RT ln [X] inside/[X] outside + z F Vm F = 23,000 cal/mol V R = 1.987 cal/ mol K Membrane potential is .07 V Temperature is 273 K Using the information above and image please answer these questions : Is the concentration of sodium higher on the outside or the inside of the presynaptic cell? Would the movement of sodium be active or passive moving OUT of the presynaptic cell? SHOW your work.