Principles of Life for the AP Course (2nd Edition)

Published by W. J. Freeman
ISBN 10: 1464156417
ISBN 13: 978-1-46415-641-0

Chapter 5 - Section 5.4 - Large Molecules Cross Membranes via Vesicles - Apply The Concept - Page 95: 7

Answer

Potassium equalizes between the two cells because it is moving passively. Since potassium is an electrically charged atom it cannot move directly through the membrane and must have a protein channel to move. An example of this type of protein is the sodium/potassium pump.

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