Question

differences and similarities between simple diffusion, facilitated in the small intestine ​

Answer 1

In facilitated diffusion, substances move into or out of cells down their concentration gradient through protein channels in the cell membrane. Simple diffusion and facilitated diffusion are similar in that both involve movement down the concentration gradient.

Answer 2

In simple diffusion, the movement of particles occurs along the direction of the concentration gradient. In facilitated diffusion, the movement of molecules can occur both in direction and opposite of the concentration gradient. Simple diffusion is mostly involved in the passage of small non-polar molecules.