ANATOMY

Detailed explanation-1: -There are two main classes of cells, the B cells that mature in the bone marrow, and the T cells that mature in the thymus gland.

Detailed explanation-2: -Blood contains many types of cells: white blood cells (monocytes, lymphocytes, neutrophils, eosinophils, basophils, and macrophages), red blood cells (erythrocytes), and platelets.

Detailed explanation-3: -Types of white blood cells are granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells). Checking the number of white blood cells in the blood is usually part of a complete blood cell (CBC) test.

Detailed explanation-4: -Your blood is made up of red blood cells, white blood cells, platelets, and plasma. Your white blood cells account for only about 1% of your blood, but their impact is big. White blood cells are also called leukocytes. They protect you against illness and disease.

Detailed explanation-5: -White blood cell formation occurs in the soft tissue inside of your bones (bone marrow). Two types of white blood cells (lymphocytes) grow in the thymus gland (T cells) and lymph nodes and spleen (B cells).