Origin of Blood Cells
Animal Tissues of Class 11
Origin of Blood Cells
The process of formation of blood cells is called haemopoiesis or haematopoiesis.
The process of formation of erythrocytes is called erythropoiesis. The erythrocytes are formed in liver spleen and lymph nodes in the embryo; and in the red bone marrow in the adult. The process of erythropoiesis is completed in 72 hours.
Stem cells or Myeloblasts → Proerythroblasts → Erythroblasts → Normoblasts → Reticulocytes → Erythrocytes.
Development of RBC’s is controlled by a feed-back mechanism. Deficiency of oxygen (hypoxia) and a hormone called erythropoietin, secreted by the kidneys, stimulates the bone marrow to increase its production of erythrocytes.
- Tissue
- Types of Animal Tissues
- Epithelial Tissue
- Covering and Lining Epithelium
- Glandular Epithelium
- Connective Tissue
- Skeletal Tissues
- Vascular Tissues
- Origin of Blood Cells
- Erythrocytes/RBC's
- Leucocytes/WBC's
- Blood Clotting
- Lymph
- Muscular Tissue
- Nervous Tissue
- Integument
- Exercise 1
- Exercise 2
- Exercise 3
- Exercise 4
- Exercise 5
- Exercise 6
