Question

Life span of human WBC is normally
A. 13-20 days
B. 80-90 days
C. 100-120 days
D. 20-30 days

Answer 1

Hint: The types of blood cells that provide immunity to our body and prevent diseases. These are colorless and survive for two weeks.

Complete answer:
WBCs or White Blood Cells or erythrocytes are the type of blood cells that are colourless as they do not contain haemoglobin. They survive in the body for around 13 to 20 days and then are destroyed by the lymphatic system.

Additional Information: There are two major types of WBC
Granulocyte: This group contains Eosinophils, basophils, neutrophils
 Agranulocyte: This group contains Monocytes and lymphocytes. Out of these neutrophils are highest in number (60% of total).

These cells provide immunity to our body by producing antibodies against infection and carry out different functions. Their shape is irregular and contains the nucleus. On average, they are present very less in number and are about 6000-8000 per cubic metre. These are manufactured by the bone marrow. They are found in both the cardiovascular system and the lymphatic system. They contribute to 1% of the blood volume.
The function of different WBCs

-Monocytes neutrophils help in phagocytosis.
-Basophils are responsible for the inflammatory reactions and the secretion of histamine, serotonin etc.
-Eosinophils prevent infections and are related to allergies.
-Lymphocytes which are of two types-B and T are the ones who have the charge for the immune response.

So, the correct answer is ‘13-20 days'

Note: Phagocytosis is the process carried out by the WBC in which they engulf the foreign particles like bacteria, dying cells etc in order to prevent damage to the organism. The lymphatic system excludes the RBCs and constitutes tonsils, spleen, adenoids, thymus etc. When WBCs undergo uncontrolled division it is Leukemia or blood cancer.