# Discuss how a change in na or k conductance would affect the resting membrane potential

Edit Nearly all cells from animals, plants and fungi function as batteries, in the sense that they maintain a voltage difference between the interior and the exterior of the cell, with the interior being the negative pole of the battery. The voltage of a cell is usually measured in millivolts mVor thousandths of a volt.  What is the total metabolic rate of the horse? What is the mass specific metabolic rate of the mouse? What is the mass specific metabolic rate of the horse? Fill in the "?

• Dr. J Discusses Medical Physiology: Membrane Potentials
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If Tusko weighs kg, what is the dosage based on weight alone using the information from the cat? Based on the cat mass specific metabolic rate 0. Huey Researchers had found that a daily dose of mg acrylamide for life! The California Attorney General was alarmed by this finding and wanted to force warning labels on French fries and potato chips, because cooking of these starches produces acrylamide.

However, a newspaper article discounted this as a problem because the author felt that based on the rat data a human would need to eat 35, mg of acrylamide per day to induce cancer. Compute the daily safe dose if risk scales not with mass but with total metabolic rate Metabolic rate for mammals: Compute the total MR for the 1 kg rat and the 70 kg human How many times greater is the human's MR versus the rat?

Mass specific MR for mammals: If the total metabolic rate of a 10 kg child is half that of a kg adult, what is the proper dose based on MR alone?

All questions require answers that fully explain the conditions, causes, and results. Fill in the six empty boxes in Fig. What is the difference between a heterothermic endotherm and a homothermic endotherm?

What is the difference between temperature and heat? Why are ecologists and other biologists concerned about the affects of global warming Fig. Water at 10 degrees C feels colder than air at the same temperature. Be able to calculate surface area to volume ratios for cubes and spheres.

How does surface area change as volume changes? Why is surface area to volume important for thermal regulation? What is the relationship between conduction and convection in relation to heat loss?Cam 11 in K +-free media has an extremely low resting membrane potential [near the equilibrium potential for K + (E K) (Satow and Kung, )], which prevents the cell from responding with an adequate hyperpolarization for the on-response or depolarization of the off-response.

Discuss what is going on the K leak channel, voltage gated Na channel and voltage gated K channel in the resting, rising, falling, and recovery phases and how this relates to the membrane potential at each of these four phases. Figure illustrates the components of the membrane conductance, namely G Na and G K, and their sum G m during a propagating nerve impulse and the corresponding membrane voltage V m.

## Week 2 Discussion: Action Potential Exercise

This is a numerical solution of Equation (after Hodgkin and Huxley, d). The resting potential of a cardiac muscle cell is about −85 mV and, as in other excitable cells, this occurs as a result of the ionic concentration gradients maintained by the action of the Na + /K .

Oct 21,  · The membrane potential is established by the gradients of the different ions across the membrane -- potassium ions inside, sodium ions outside mostly -- and is essentially the sum of each equilibrium potential for each ion weighted by the membrane conductance to that blog-mmorpg.com: Resolved.

The holding potential at which no net membrane current flowed was - m V, which coincided with the membrane potential during quiescence. The resting potential in quiescence increased by approximately 17 m V for a tenfold decrease in the extracellular Na+ concentration, and 22 m V for a tenfold increase in the K+ concentration. The relative membrane conductance decreased transiently on removing Na+ . Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. A change in K+ conductance would have a greater effect on the resting membrane potential than a change in Na+ conductance would. Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. Your answer: IF the conductance of K+ increases the membrane potential becomes negative. However if the conductance of K+ is. This preview has intentionally blurred sections.

Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. A change in K+ conductance would have a greater effect on the resting membrane potential than a change in Na+ conductance would.

Action Potential Conductance