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# Biology question help?

Real human cells are spherical and approximately 50 µm in diameter. What would the surface area to volume ratio be for a human cell that size? Convert the µm into centimeters to start.

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- SpacemanLv 71 month ago
D = cell diameter = 50 μm = 0.005 cm

r - cell radius = D/2 = 25 μm = 0.0025 cm

SA = cell surface area = 4πr² = 7.85398E-05 cm²

V = cell volume = 4πr³/3 = 6.54498E-08 cm³

SA:V = surface area to volume ratio = to be determined

SA:V = SA/V = 7.85E-05 cm²/6.54E-08 cm³ = 1,200 cm^-1

Source(s): https://www.digitaldutch.com/unitconverter/length.... https://en.wikipedia.org/wiki/Surface-area-to-volu... https://www.mathsisfun.com/geometry/sphere-volume-...- Login to reply the answers

- 1 month ago
Surface area to volume ratio of a sphere is S/V=3/r r=50micrometers or 50*10^-4cm. S/V=600cm^-1

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