For the dendrite with passive membrane and resting potential…
For the dendrite with passive membrane and resting potential of -70 mV in the figure below (the length is much longer than the portion shown), a constant NEGATIVE current is injected to the dendrite through the electrode on the left (red). At steady state, another electrode on the right (blue) reads a membrane potential of -75 mV. Which of the following would be a possible value of the membrane potential read by the electrode on the left at the same time?
Read DetailsTHIS IS A FILE UPLOAD QUESTIONS AND SO MOVED UP …so that y…
THIS IS A FILE UPLOAD QUESTIONS AND SO MOVED UP …so that you plan for adequate time to upload it. Assume a neuron has only leak channels, i.e., is a passive cell. And there is a positive (depolarizing) current injection. (i) Describe in steps, with a clearly labeled sketch (of both time and voltage axes), the changes in the membrane potential from the time the current injection starts till the voltage reaches steady state. (ii) Then add the current channel Na+ (only) to the setup with leak channels, and provide the same step-by-step description as above. (iii) Repeat step (ii), but now, instead of Na+, add the current channel K+ (only) to the setup with leak channels, i.e., leak + Na+. Provide the same sketch and step-by-step description as above. (iv) Finally, consider the case with leak, Na+ and K+ channels, and provide a sketch and step-by-step description as above. Upload the sheet with your answers.
Read DetailsTHIS HW-QUIZ IS CLOSED BOOK AND CLOSED NOTES. AND NO ELECTR…
THIS HW-QUIZ IS CLOSED BOOK AND CLOSED NOTES. AND NO ELECTRONICS DEVICES OF ANY TYPE ARE PERMITTED, e.g., calculators, cell phones, other browser screens, etc. I understand this. Also, I affirm that I will not give or receive any unauthorized help on this exam, and that all work will be my own.
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