How well do you know your body? Answer this simple GK Test Riddle and find out.
In a normal human body, the total number of red blood cells is
A. 15 trillion
B. 20 trillion
C. 25 trillion
D. 30 trillion
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Answer: Option D.
Red blood cells (RBCs), also called erythrocytes, are the most common type of blood cell and the vertebrate’s principal means of delivering oxygen (O2) to the body tissues—via blood flow through the circulatory system. RBCs take up oxygen in the lungs and release it into tissues while squeezing through the body’s capillaries.
A typical human red blood cell has a disk diameter of approximately 6.2–8.2 µm and a thickness at the thickest point of 2–2.5 µm and a minimum thickness in the centre of 0.8–1 µm, being much smaller than most other human cells. Adult humans have roughly 30 trillion red blood cells at any given time, comprising approximately 70% all cells by number.