[claudepa]

Hi
Could anybody tell me if more precise measurements are known for 1) The number of cells in a human body (my rough estimation is several hundred millions cells). 2) How many different cell types in a human body (my rough estimation is 250 different cell types. Thank you

[EnricoPallazzo]

According to this paper http://www.ncbi.nlm.nih.gov/pubmed/23829164 there are approx. 3.72×10^13 human cells in our body. Thats around 100000-times more cells than you estimated 🙂
Accordingto this source (http://sciencenetlinks.com/student-teac … your-body/) there are approx. 200 different types of cells, each containing 20 different types of structures or organelles.

Interestingly, we carry about 10-times more bacterial cells than human cells in our body at any time! Our intestine alone harbours around 500 different species of microorganisms.

[Author]

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