Question

Read the following (A -D):-
A. RBCs are the most abundant of all the cells in blood.
B. A healthy adult man has no an average 5 billions to 5.5 billions of RBCs mm-3 of blood.
C. RBCs are formed in the liver in adults.
D. RBCs are devoid of nucleus in most of the mammals and are biconcave in shape.
How many of the above statements are incorrect?
A. 4
B. 3
C. 2
D. 1

Answer 1

Blood cells are also called erythrocytes. The synthesis of erythrocytes is known as erythropoiesis. The average number of RBCs is between 4.2 as well as 6.2 million per cubic millimetres. RBCs are synthesized from bone marrow. They are biconcave in shape along with it most of the mammals do not have the nucleus in RBCs.

Complete answer:
Red Blood Cells are known for their bright red colour. Red cells are the most abundant cell in the blood, accounting for about 40 to 45 percent of its volume in a body.
Production of red blood cells is powered by erythropoietin, a hormone produced mainly by the kidneys. Red blood cells start as immature cells in the bone marrow and after approximately seven days of maturation are released into the main bloodstream. Unlike many other cells, red blood cells have no nucleus as well as can easily change shape, this helps them to fit through the various blood vessels in your body.
Statement A – Is correct as RBCs are the most abundant cells in blood.
Statement B – Is not correct as a healthy man has up to 4.2 to 6.2 million per cubic millimeters of blood.
Statement C – Is not right as RBCs are formed in the bone marrow in the human body.
Statement D – Is right as RBCs are devoid of nucleus in most of the mammals along with it they are biconcave in shape.

Hence, B and C statements are incorrect statements and the correct answer to the question is option- C -"2".

Note: Blood appears red because of the large number of red blood cells present in the body, which get their colour from the haemoglobin. The percentage of whole blood volume that is made up of red blood cells is known as the hematocrit as well as is a usual measure of red blood cell levels.