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Membranes and transport

This course contains 5 segments:

The plasma membrane

Learn about the amazing and versatile barrier that surrounds all of your cells: the plasma membrane!

Diffusion and osmosis

Ever wonder why plants wilt if you don't water them? Find out here, and learn more about the basic principles of probability that underlie movement of water and other molecules in biological systems.

Passive transport

Read more

This course contains 5 segments:

The plasma membrane

Learn about the amazing and versatile barrier that surrounds all of your cells: the plasma membrane!

Diffusion and osmosis

Ever wonder why plants wilt if you don't water them? Find out here, and learn more about the basic principles of probability that underlie movement of water and other molecules in biological systems.

Passive transport

Sometimes it pays to go with the flow! Learn about passive transport mechanisms, in which molecules travel across the plasma membrane by moving down their concentration gradients (no energy expenditure required).

Active transport

In active transport, the cell has to pay (often, in the form of ATP) to move molecules against their gradients. Learn more about the amazing protein machines that make this possible.

Bulk transport

Macrophages (specialized immune cells) in your body can "eat" bacteria, pulling them into the cell and digesting them. Learn how they accomplish this feat, and how cells transport other large molecules across the plasma membrane.

This course is no longer available. Find a similar course by searching these:
cellular biology molecular transport plasma membrane membrane structure active transport passive transport

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2 hours
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This course belongs to a collection called Biology. It's comprised of 31 courses:
  1. Intro to biology
  2. Chemistry of life
  3. Water, acids, and bases
  4. Properties of carbon
  5. Macromolecules
  6. Energy and enzymes
  7. Structure of a cell
  8. Membranes and transport (viewing)
  9. Cellular respiration
  10. Photosynthesis
  11. Cell signaling
  12. Cell division
  13. Classical and molecular genetics
  14. DNA as the genetic material
  15. Central dogma (DNA to RNA to protein)
  16. Gene regulation
  17. Biotechnology
  18. Developmental biology
  19. Bacteria and archaea
  20. Viruses
  21. Evolution and the tree of life
  22. History of life on Earth
  23. Ecology
  24. Biodiversity and conservation
  25. Behavioral biology
  26. Principles of physiology
  27. Human biology
  28. Studying for the AP Biology exam?
  29. Crash Course: Biology and Ecology
  30. Meet the biology professional
  31. Plant biology
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