AP BIOLOGY

Detailed explanation-1: -An excellent example of facilitated diffusion is the transport ofd-glucose into skeletal muscle and adipose cells by theGLUT4 transporter. Glucose transport can proceed as long as the blood concentration of glucose is higher than the intracellular concentration of glucose and as long as the carriers are not saturated.

Detailed explanation-2: -Facilitated diffusion therefore allows polar and charged molecules, such as carbohydrates, amino acids, nucleosides, and ions, to cross the plasma membrane.

Detailed explanation-3: -Channel proteins, gated channel proteins, and carrier proteins are three types of transport proteins that are involved in facilitated diffusion. A channel protein, a type of transport protein, acts like a pore in the membrane that lets water molecules or small ions through quickly.

Detailed explanation-4: -A facilitated diffusion example in real life can be seen when a molecule crosses a cellular membrane. In order for the molecule to cross the membrane, it must first be able to dissolve in the lipid bilayer of the membrane. Once it is dissolved, it can then diffuse through the hydrophobic region of the membrane.