Answer 1:
Great question! Amazingly, an adult human body
contains about 50100 trillion cells (that´s
100,000,000,000,000)! A lot of zeros, right!? So
how do we get this number? Well it actually is not
that complicated, mathematically.
First, we assume that an average eukaryotic
(animal) cell is about 10 micro meters across (it
has a diameter of 10 micro meters, also called
microns). Then we assume that a human cell is a
cube (as opposed to being a sphere or some other
shape). This allows us to calculate the volume of
the cell as 10x10x10 cubic microns = 1000 cubic
microns. Since there are one billion cubic microns
in a cubic millimeter (mm, the smallest lines on a
centimeter ruler), we can make the next
calculation that there are one million cells in a
cubic mm. Ok, so now we can take it up another
measurement as we know that there are one million
million cells in a cubic decimeter, and one cubic
decimeter is the same as one liter. In other
words, there are one trillion cells in one liter
of volume.
Next, we assume that 1 liter is about the same
as 1 kilogram (kg) because this is the conversion
that works for water (and we are mostly water
after all). Now we know that there are roughly 1
trillion cells in one kilogram. How many kg are
you? I´m about 53 kg, meaning I have about 53
trillion cells in me! How many trillion cells do
you have in you?

Answer 2:
No one really knows the exact number of cells,
but we can approximate to about 1050 trillion.
Cells are always created and destroyed in the
human body. About 300 million cells die every
minute in our bodies! Since different cells have
different jobs in our body, there are about 210
different "types" of cells. Something interesting
is that about 95% percent of cells found in our
body are bacterial cells mainly in your digestive
tract.
Cells are so small that they are really hard to
see unless under a microscope. When you rub the
inside of your cheek, you get thousands of cheek
cells onto your finger, and when you brush off
your hand millions of skin cells come off.
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