Question

In man, the number of R.B.C. per cubic mm of blood is

• A. $1$ to $3$ millions
• B. $5$ to $5.4$ millions
• C. Less than one million but more than 50,000
  
• D. Less than 50,000
  

Answer 1

The correct option is B $5$ to $5.4$ millions

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. RBCs are the most abundant of all the cells in the blood. RBCs have an average lifespan of 120 days after which they are destroyed in the spleen (graveyard of RBCs). A healthy adult man has, on an average, 5 million to 5.4 millions of RBCs.

So, the correct answer is '5 to 5.4 millions'.