Question

OD. B cells; T cells, and NK cells Question 6 The following are lymphocytes NK cells B cells, T cells, NK cells, and monocytes B. B cells ОА, Ос. T cells OE. B cells and T cells OF.

Answer 1

Answer:

6). B). B cells, T cells, NK cells, and monocytes

Explanation:

Depending upon the absence or presence of granules in the cytoplasm, the leucocytes are categorized into Agranular leucocytes and Granular leucocytes.

A granular Leucocytes:

          The cytoplasm does not contain granules and the nucleus is large and not lobed. They constitute about 25-30% of total WBC. They are two types.

1. Lymphocytes: Ex: T, B cells & NK cells.
2. Monocytes: They are the largest of all WBC. The nucleus is large with horse – shoe shaped nucleus. These cells are phagocytic in action. They act as scavengers and help in removing damaged tissues and dead cells.

Granular Leucocytes:

They are large in size and their cytoplasm is granular. The granulocytes constitute about 75% of total WBC. The nucleus is irregular or divided into many lobes. They are categorized into three types on the basis of structure of nucleus and the affinity of the granules to acidic or basic dyes.

1. Neutrophils: They are most abundant of the WBC. The nucleus is with 3 to 5 lobes connected by thin chromatin strands. They are phagocytic in function. They protect the body against the invasion of bacteria. They are capable of squeezing out of the capillary wall and moving to the infected areas to ingest or kill microbes. The life span of neutrophils is about 30 hours.
2. Eosinophils: They are phagocytic in nature and with bilobed nucleus. The number of eosinophils increase in the allergic conditions such as asthma and parasitic infections.
3. Basophils: They have irregular shaped nucleus. They are stained with basic dyes. Basophils release heparin and histamine in the blood and are responsible for anticoagulatory function and inflammatory response. Basophils play crucial role in allergic reactions.