Answered: What happens to the sodium when the…

Science

Biology

What happens to the sodium when the sodium channels open?

Science Of Agriculture Biological Approach

5th Edition

ISBN:9780357229323

Author:Herren

Publisher:Herren

Chapter10: Animal Systems

Section: Chapter Questions

Problem 3SLA

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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

At rest, a neuron has a lower concentration of sodium than the surrounding fluid. When a neuron sends a signal, it opens sodium channels. What happens to the sodium when the sodium channels open?

The sodium diffuses out of the cell.

The sodium is pumped into the cell.

The sodium is pumped out of the cell.

The sodium diffuses into the cell.

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