Page 126 - MNU microbiology theoritical 2025

General Microbiology & Immunology (PM 401) Second level Semester 4 2024/2025

Cellular Elements of Blood

Red blood cells (Erythrocytes)

- RBCs are biconcave cells without nucleus in humans; also known as

erythrocytes.

- RBCs contain the iron-rich protein called hemoglobin.

- RBCs are the most copious blood cells produced in bone marrows.

- Their main function is to transport oxygen from and to various tissues and

organs.

White blood cells (Leucocytes)

- Leucocytes are colorless blood cells. They are colorless because they are devoid

of hemoglobin.

- They are further classified as granulocytes and agranulocytes. WBCs mainly

contribute to immunity and defense

mechanism.

General Microbiology & Immunology (PM 401) theoretical handbook Page 115