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Property Organism Value Units ID Details
Number of hairs on human head Human Homo sapiens 90,000-150,000 unitless 101509 Amazing numbers in biology...
Number of bacteria on skin Human Homo sapiens 1e+12 unitless 105712 Berg RD. The indigenous...
Number of receptors on each taste bud Human Homo sapiens 50-150 unitless 100702 http://faculty.washi...
Number of cell divisions in an average human lifespan Human Homo sapiens ~1E+16 Cell divisions 100379 Weinberg, R. The Biology...
Number of microvilli per cell on HeLa cell Human Homo sapiens 200 microvilli/cell 102481 Fisher HW, Cooper TW....
Hayflick's limit - number of times normal human cells divide Human Homo sapiens 50 (±10) unitless 105586 Hayflick L. The limited...
Number of fibers in human optic nerve Human Homo sapiens 1.2e+6 unitless 100696 Balazsi AG, Rootman J...
Number of antigen-receptor molecules on T cell surface Human Homo sapiens 30000 receptors/cell 103567 Janeway's Immunobiology...
Number of bacteria in the human intestinal tract Human Homo sapiens ≤1E+14 bacteria/intestinal tract 110957 Suau A et al., Direct...
Number of ion transport sites on red blood cell membrane Human Homo sapiens 1e+6 membrane transport sites/cell 111367 Brahm J. Temperature...
Number of bird specimens on Earth Biosphere 200 - 400 billion (10^9) birds 116940 Kevin J. Gaston & Tim...
Number of People Who Have Ever Lived on Earth Human Homo sapiens 1.08e+11 Humans 111241 Population Reference...
Number of functional gene segments in human immunoglobulin loci Human Homo sapiens Figure - link N/A 111352 Kenneth M. Murphy, Paul...
Estimates on the total number of phosphoproteins and p-sites for the various species (human, mouse, Arabidopsis and yeast), based on different analyses Eukaryotes Table - link N/A 113378 Vlastaridis P et al....
Number of microbial cells in human body Human Homo sapiens 10^14 (see BNID 113000 for more updated value of 3.8x10^13) microbial cells (mostly bacteria)/human body 102392 Savage DC. Microbial...
Number of hairs in human eyebrows Human Homo sapiens 600 unitless 101511 Amazing numbers in biology...
Number of cilia on cells that contain multiple cilia Human Homo sapiens 200-300 unitless 105742 Fliegauf M, Benzing T...
Number of validated hormone-responsive androgen receptor target genes in immortalized human prostate epithelial cell line Human Homo sapiens 172 target genes 117006 Carroll SB. Evo-devo...
Data on the concentration of components of human plasma proteins Human Homo sapiens Table - link N/A 112317 Krebs HA. Chemical c...
Number of cell types in human body Human Homo sapiens 200 Unitless 103626 Junqueira, Carneiro, Kelley...