Question

the sodium - potassium (na⁺ - k⁺) pump transports both sodium and potassium ____ their concentration gradients in a process called ____. multiple choice up, active transport up, facilitated transport up, cotransport down, active transport down, countertransport

Explanation:

The sodium - potassium pump moves sodium and potassium ions against their concentration gradients (up the gradient). This process requires energy and is called active transport. Facilitated transport and cotransport do not involve moving against the gradient in the context of the sodium - potassium pump. Moving down the gradient does not describe the action of the sodium - potassium pump. Countertransport is not the correct term for this process.

Answer:

up; active transport