Question

Smaller, lipid soluble molecules diffuse faster through the cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically

Answer 1

Facilitated diffusion:

• The plasma membrane is a bilayer lipid membrane containing integral and peripheral proteins.
• The diffusion of any substance across a membrane is therefore dependent on its solubility in the lipids of the membrane.
• Lipid-soluble substances diffuse faster through the membrane.
• Hydrophilic substances are not able to pass through the membrane easily so their movement has to be facilitated. This process is called facilitateddiffusion.
• Membrane or integral proteins provide sites for facilitated diffusion

Final answer Proteins

Summary:

Facilitated diffusion

Smaller, lipid soluble molecules diffuse faster through the cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically proteins.

Final answer
Proteins