Question

Which type of cell is known as a cartwheel?
A. Mast cell
B. Plasma cell
C. Reticular cell
D. Adipose cell

Answer 1

Hint: In our body each and every body is different in appearance, structure and function. Some cells are known by the name according to their structure and appearance.

Complete answer: In blood many types of cells are found. These are RBC, WBC, and platelets. WBC (white blood cells) are white in appearance and there are many subtypes of these cells. Some WBCs are granular while others are agranular. Lymphocyte and monocyte cells are agranular. Lymphocyte cells are of two types B-lymphocytes and T- lymphocytes.
B-lymphocyte cells synthesize antibodies and are responsible for humoral immunity. These are mononuclear blood cells. These cells secrete antibodies and antibodies interact with antigens.
Some B-lymphocyte cells are small-sized and do not interact with antigen. These cells are at the G0 stage of the cell cycle. Whenever these cells come in contact with the antigen, these are activated and enter in the G1 phase, then in the S phase and G2 phase. Size increases in cells. Now, this cell is called a lymphoblast.
Lymphoblast cells differentiate and then create effector cells. These effector cells are known as plasmocyte cells, plasma cells, and B-cells. These cells secrete antibodies. That’s why they have well-developed ER and Golgi bodies.
Plasma cells have dense cytoplasm and eccentric nuclei with heterochromatin. The nucleus looks like a cartwheel. So these cells are also known as cartwheels.
Hence, the correct answer is option B.

Note: When lymphoblast cells become mature and divide, form two types of cells. These are plasma cells and memory cells. Memory cells are also produced by T-lymphocyte cells. Memory cells have an important role in immunity as these cells remember the past infection of pathogens.