Khan Academy
Khan Academy: Biology: Parts of a Cell
A detailed description of the anatomy of a cell. [21:03]
Sophia Learning
Sophia: Cell Membrane Transport Processes Diffusion
A narrated, video tutorial illustrating how diffusion works. It shows the concentration gradient that diffusion follows, explains the difference between diffusion and facilitated diffusion, and presents real life examples. [7:46]
Sophia Learning
Sophia: Cell Membranes
Discover in detail, the structure and function of the cellular membrane. [5:56]