AP BIOLOGY

Detailed explanation-1: -Glucose transport is a facilitated diffusion example. Since glucose is a large polar molecule, it cannot pass through the lipid bilayer of the membrane. Thus, it needs carriers called glucose transporters to pass through.

Detailed explanation-2: -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-3: -Facilitated diffusion is the passive movement of molecules along the concentration gradient.

Detailed explanation-4: -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-5: -Facilitated transport is a type of passive transport. Unlike simple diffusion where materials pass through a membrane without the help of proteins, in facilitated transport, also called facilitated diffusion, materials diffuse across the plasma membrane with the help of membrane proteins.