How are potassium and sodium transported across plasma membranes?
a. By passive electrolyte channels
b. By coupled channels
c. By adenosine triphosphate enzyme (ATPase)
d. By diffusion
ANS: C
The transporter protein ATPase is directly related to sodium and potassium transport via active transport. Electrolyte movements require energy and do not move passively, nor are they trans-ported by diffusion. Enzymes, not electrolytes, are passed via coupled channels.
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