SMRTR Science & EngineeringJul 28, 2026Interesting Engineering

How many cells are in the human body? Here’s what the science says

SMRTR summary

The human body contains ~30 trillion cells, with 70% being red blood cells. Bacterial cells exist in nearly equal numbers, and most cell types are continuously replaced throughout life.

SMRTR provides this summary for quick context. The original article belongs to Interesting Engineering.

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