NEETZoologyBody Fluids and Circulation
How many RBCs are present in the blood of a healthy adult man?
Options
- A6000-8000 mm⁻³
- B5-5.5 million mm⁻³
- C120 days
- D12-16 gms in 100 ml
Correct answer
B. 5-5.5 million mm⁻³
Step-by-step solution
Erythrocytes or red blood cells (RBC) are the most abundant of all the cells in blood. A healthy adult man has, on an average, 5 million to 5.5 million of RBCs mm–3 of blood . RBCs are formed in the red bone marrow in the adults. RBCs are devoid of nucleus in most of the mammals and are biconcave in shape. They have a red colored, iron containing complex protein called haemoglobin, hence the color and name of these cells. A healthy individual has 12-16 gms of haemoglobin in every 100 ml of blood. These molecules pl