The number of red blood cells

Question:

The number of red blood cells per cubic millimetre of blood is approximately mm3)

Solution:

The average body contain 5 L of blood.

Also, the number of red blood cells per cubic millimetre of blood is approximately 5.5 million.

Blood contained by body = 5 L = 5 x 100000 mm3

Red blood cells = 5 x 100000 mm3

Blood = 5.5 x 1000000 x 5 x 100000= 55 x 5 x 105 + 5

= 275 x 1010 = 2.75 x 1010 x 102 = 2.75 x 1012

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