Bone Marrow - Edubirdie

University:
Liberty University
Course:
BIOM 500 | Introduction to Biomedical Sciences
Academic year:

2024
Views:

173

Pages:

6
Author:

Sheha A.

Types of Bone Marrow Two types of bone marrow are present: Yellow colour bone marrow Red colour bone marrow 1) Yellow Colour Bone Marrow: It is present in fat. It is inactive. 2) Red Colour Bone Marrow: It is active. Red bone marrow produces RBC after birth. In adults, only red bone marrow produces RBC after birth. Stages of Erythropoiesis: Hemocytoblast Proerythroblast Basophilic erythroblast Polychromatophilic erythroblast Orthochromatophilic erythroblast Reticulocyte RBC Changes during erythropoiesis: Decrease in size Nucleus disappears Increase in hemoglobin content Loss of organelles **1. Haemocytoblast** * Size: 18-20 microns * Nucleus: Large nucleus with numerous nucleoli * Cytoplasm: Scanty basophilic cytoplasm * It undergoes mitosis to form proerythroblast **2. Proerythroblast** * Size: 15-20 microns * Nucleus: Large nucleus with nucleoli * Cytoplasm: Scanty basophilic cytoplasm * It undergoes mitosis to form basophilic normoblast **3. Early Normoblast** * Size: 10-15 microns * Nucleus: Small nucleus with nucleoli * Cytoplasm: More amount of basophilic cytoplasm * It undergoes mitosis to form intermediate normoblast **4. Intermediate Normoblast** * Size: 10-15 microns * Nucleus: Cart wheel-like nucleus, and nucleoli is absent * Cytoplasm: Polychromatophilic cytoplasm * This does not undergo further mitosis division.