Question

The most active phagocytic white blood cells are
A. Eosinophils and lymphocytes
B. Neutrophils and monocytes
C. Neutrophils and eosinophils
D. Lymphocytes and macrophages

Answer 1

Hint: Blood which is a specialized fluid contains four main components i.e. red blood cells, white blood cells, plasma, and platelets. It performs various functions such as transporting oxygen and nutrients to the lungs and tissues.

Complete answer:
White blood cells are also known as leukocytes or white blood corpuscles. These white blood cells are found in the bone marrow and are regularly found in the blood and lymph tissues. There are three significant divisions of white blood cells such as granulocytes, monocytes, and lymphocytes. The granulocytes are also classified as neutrophils, eosinophils, and basophils. Granulocytes are phagocytes that ingest unfamiliar cells. White blood cells are also granulocytes in nature.
> Neutrophils- They build almost fifty percent of the WBC (White Blood Cells) count. They are the first line of defense that responds to various bacteria and viruses.
> Eosinophils- These cells are the second most important cells that fight against bacteria. Eosinophils are related with hypersensitive responses and can kill multicellular parasites.
> Basophils- They only account for one percent of the WBC count. These cells play an important role in forming an immune response against pathogens and are engaged in allergic reactions.
> Monocytes- These cells can form into two sorts of cells i.e. dendritic cells, and macrophages. Dendritic cells are antigen- introducing cells, whereas macrophage cells are a type of WBC that engulfs debris and digests cellular waste.
> Phagocytosis is a process where specialized cells known as phagocytes kill and digest the invading microorganisms. Monocytes and neutrophils are considered active phagocytic white blood cells because these white blood cells respond at the site of infection and phagocytize the invading microorganisms.

So, as we have discussed the correct option is B (Neutrophils and monocytes).

Note:
White blood cells are considered immune cells which help in protecting from the disease by killing the invading pathogens when they enter the body. They are also known as the Police force of the body.