Introduction to the cell | Cells | High school biology | Khan Academy

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Beef at the Cellular Level: Red Blood Cells & T Cells Explained

Repost from @Scienceoftheuniverse This is a single human cell. The white filament-like structures are microtubules, and the small colored particles are ribosomes. Your body contains on the order of ~37 trillion cells. Each cell functions like a highly organized, self-regulating factory operating continuously. There is no central “supervisor”—yet thousands of processes run in parallel with remarkable coordination. Every ribosome is constantly building proteins by linking amino acids together. In