how many rbc are find in a male body?

Answer 1

For a man you'd expect a count of 4.2 - 5.9 x 10^12 cells per liter.

Total blood volume is about 5-6 litres.

So you can approximate that you would get

5x10^12 cells/liter * 5 liters

=25 x 10^12 red blood cells in the body.

These values will obviously vary between individuals though.

Answer 2

Adult humans have roughly 2–3 × 1013 red blood cells at any given time (women have about 4 million to 5 million erythrocytes per cubic millimeter (microliter) of blood and men about 5 million to 6 million; people living at high altitudes with low oxygen tension will have more). Red blood cells are thus much more common than the other blood particles: There are about 4,000–11,000 white blood cells and about 150,000–400,000 platelets in a cubic millimeter of human blood. The red blood cells store collectively about 3.5 grams of iron, more than five times the iron stored by all the other tissues combined.

Now considering that an adult male has somewhere between 5-7 liters of blood (depending on their body size), you can figure out how many RBC's they have somewhere between:
(5x10^6) x 10^6 x 5 = 2.5 x 10^13
and:
(5x10^6) x 10^6 x 7 = 3.5 x 10^13

Answer 3

well if you start counting, it will take you hundred thousands years. But it is easy if u work with the number density. like the number of rbc in unit volume (per cc)