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

by Hillis, David M.; Sadava, David E.; Hill, Richard W.; Price, Mary V.

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: 3

Answer

Sodium is low because it is an ion. Ions cannot move passively through the membrane because they are charged molecules. They require a protein channel or pump. One example of this type of molecule is the sodium/potassium pump.

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