Question

this video shows potassium ions moving by facilitated diffusion until they reach a state of equilibrium. select the true statements. once equilibrium is reached via facilitated diffusion, molecules keep moving. charged molecules can only cross the cell membrane by active transport. molecules can only cross the cell membrane directly through the phospholipids. in facilitated diffusion, molecules move from areas of high concentration to areas of low concentration to reach equilibrium.

Explanation:

In facilitated diffusion, a dynamic equilibrium is reached where molecules still move back - and - forth but there is no net change. And facilitated diffusion is a passive process where molecules move down their concentration gradient (high to low). Charged molecules can cross by facilitated diffusion too (not just active transport), and molecules can cross via transport proteins in addition to directly through phospholipids.

Answer:

1. Once equilibrium is reached via facilitated diffusion, molecules keep moving.
2. In facilitated diffusion, molecules move from areas of high concentration to areas of low concentration to reach equilibrium.