Question

Abnormal increase in RBC count is called as
A. Pneumonia
B. Leukaemia
C. Anaemia
D. Polycythemia

Answer 1

Hint:Blood is the most commonly used body fluid by most of the higher organisms including humans for or the purpose to transport some substance. blood is a special connective tissue consisting of a fluid Matrix, plasma, and formed elements.

Complete answer:
Formed elements considered nearly 45% of the blood . Formed elements constitute red blood cells also known as as erythrocytes and white blood cells also known as leukocytes and platelets which are also known as thrombocytes.
Erythrocytes or the red blood cells are the most abundant to all the cells in the blood. A healthy adult man has on an average 5 million to 5.5 million of RBC per mm cube of blood.
RBCs are formed in the red bone marrow in adults. RBC is devoid of the nucleus in most mammals and is biconcave in shape. They have a red-colored iron-containing complex protein called hemoglobin hence the color and name of the cells.
A healthy individual has 12 to 16 grams of hemoglobin in every hundred ml of blood. These molecules play a significant role in the transport of respiratory gases.
RBC has an average lifespan of 120 days after which they are destroyed in the spleen also known as the graveyard of RBC.
If the number of RBC increases abnormally then the condition is called polycythemia.

So, the correct answer is an option (D).

Note: White blood cells are used in the defense mechanism of the body.
Platelets are used in the clotting of blood to prevent excessive loss of blood.
If the count of WBC or white blood cells increases abnormally it is called leukemia. Pneumonia is a disease that mainly affects the lungs.