Question

Cells of human blood can be arranged in a series of increasing number per cubic millimeter of blood as follows

• A. Erythrocytes $<$ Lymphocytes $<$ Platelets
  $<$ Basophils $<$ Neutrophils
• B. Basophils $<$ Lymphocytes $<$ Neutrophils
  < Platelets $<$ Erythrocytes
• C. Lymphocytes $<$ Basophils $<$ Platelets $<$ Neutrophils $<$ Erythrocytes
• D. Neutrophils $<$ Basophils $<$ Lymphocytes
  $<$ Platelets $<$ Erythrocytes

Answer 1

Answer: (B)

Basophils are a type of granulocytes making only 0.5% of the WBC count. They are 8-10µ in size and contain coarse granules that can be stained with basic dyes. They secrete an anticoagulant called heparin and secrete serotonin and histamine and involved in inflammatory reactions.
Lymphocytes are a type of white blood cells (leucocytes) which play a significant role in maintaining the immunity of the body. They determine the specificity of the immune response to various pathogens and antigens. They constitute about 30% of the total WBC count.
Neutrophils are the common type of white blood cell found in a blood smear. They make up about 60-70% of the total amount of white blood cells and have a diameter of 12-14µm.
The blood platelets, also known as thrombocytes, are colourless and non-nucleated cell fragments formed from the breakdown of large cells called megakaryocytes. Their primary function lies in blood coagulation. The normal platelet count of an average person ranges from 150,000 to 350,000 per mm³ of blood.
Red blood cells (erythrocytes) are non-nucleated, circular, biconcave cells which transports oxygen to the tissues of the body and carries carbon dioxide from them to the lungs. The normal RBC count of an average man ranges between 5-5.5 million cells per mm³ of blood.
Thus, according to increasing count per mm³ of blood:
Basophils < Lymphocytes < Neutrophils < Platelets < Erythrocytes