The transportation of substances in and out of a cell is regulated by the cell membrane. Describe two factors that increase the rate of diffusion of a molecule across the cell membrane.

membrane surface area and the concentration gradient

Explanation:

the larger the surface area of the membrane that a substance is diffusing through , the faster the rate of diffusion . Likewise , the bigger the difference in the concentration between 2 areas , the greater the concentration gradient and the faster the rate of diffusion.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.