Transport of molecules within a cell and out of the cell requires a complex endomembrane system. Endocytosis occurs when the cell membrane engulfs particles (dark blue) outside the cell ...

A plasma membrane is permeable to specific molecules that a cell needs. Transport proteins in the cell membrane allow for selective passage of specific molecules from the external environment.

Ron Kaback didn’t believe that electrochemical gradients could power the transport of sugars and amino acids across cell membranes—until he proved that they do. A series of rodent experiments showed ...

Harpreet Singh, professor of physiology and cell biology ... Singh predicted that EVs must have ion channels to safely transport molecules from cellular interiors to the extracellular environment ...