Author: Aaron Mullally

This lesson will explain how substances move across a cell membrane through the process of diffusion as well as discuss why this process is important in our bodies.

See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

27 Sophia partners guarantee credit transfer.

245 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 21 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Terms to Know
  • Concentration Gradient

    The difference in concentration of a substance between two areas

  • Diffusion

    Movement of molecules from an area of high concentration to an area of low concentration

  • Passive Transport

    The movement of molecules across a membrane without the use of energy