Quick answer: A commonly cited estimate is on the order of tens of trillions of human cells, but the number varies with body size, age, and estimation methods.
What to know
Red blood cells account for a very large share of the count, while other tissues contribute fewer but often larger cells.
Practical context
A precise live count is not possible for an individual, and estimates continue to be refined as methods improve.
Frequently asked question
Are bacteria counted as human cells?
No. Microbes living in and on the body are distinct from human cells, although they form part of the human microbiome.
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