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 is an example of active transport. Active transport moves substances against (up) their concentration gradients. Facilitated transport and cotransport (which is a type of facilitated transport) move substances down their concentration gradients. Countertransport is a type of cotransport. So, the sodium - potassium pump transports both sodium and potassium up their concentration gradients in a process called active transport.

Answer:

up, active transport