1. BLOOD CELLS

2. LEC Nov.2016

3. Objectives
Types of blood cells
2.Hemopoiesis(Hematopoiesis)
3.Red Blood Cells(RBC)

4. BLOOD CELLS
Blood cells makes about 45 % of the total blood volume( 5600mL) i.e mL.
Blood cells are the solid phase plasma. Types:
a- Red Blood Cells ( RBC’s ) or erythrocytes.
b- White Blood Cells ( WBC’s ) or leukocytes.
c.Cell Fragments called platelets or thrombocytes

7. Hemopoiesis or Hematopoiesis
is the process of blood cells production.
Erthropoiesis: is the proliferation & differentiation of RBC’s or erythrocytes.
Leukopoiesis: is the development of WBC’s or leukocytes.
Thrombopoiesis: is the development of platelets or thrombocytes.

8. The bone marrow ---- multipotent uncommitted stem cells (pluripotential stem cells ) ---- differentiate committed stem cells ( progenitor cells ) differentiated into various differentiated types of blood cells

9. 1.Proerythroblasts ( pronormoblast ): erythrocytes develop.
2.Myeloblasts: from which granulocytes ( Neutrophil, eosinophils & basophile ) develop.
3.Lymphoblasts: From which lymphocytes ( T & B-lymphocytes ) develop.
4.Monoblast: from which monocytes develop.
5.Megakaryoblasts: from which platelets or thombocytes develop.

12. Red Blood Cells (RBC’ s( Or Erythrocytes

13. About 95 % of the volume of the blood cells consists of erythrocytes.
Red blood cells or erythrocytes
About 95 % of the volume of the blood cells consists of erythrocytes.
No nuclei in RBC.
Erythropoiesis:
is the process of RBC’s production. .

16. Regulation of red blood cell production: Role of erythropoietin.
The rate of erythropoiesis is regulated by a humoral agent known as erythropoietin.
90% of the erythropoietin is formed in the kidneys & 10% in the liver.
The function of this hormone is to stimulate committed stem cells to differentiate into proerythroblasts i.e. stimulate the synthesis of messenger RNA.
The main factor that cause the release of erythropoietin is hypoxia therapy.

18. Maturation of Erythrocytes
Cell division requires two vitamins :
Vitamin B12
Folic acid .
The type of anemia due to lack of folic acid
& vit. B12 is called megaloblastic anemia

19. Morphology
Size :diameter of 7.2 to 7.9 micrometers -- edges 2.5 micrometers thicker than the center --about 1 micrometers.
shape--biconcave discs
Content—hemoglobin, ATPase, & enzyme carbonic anhydrase,water

21. Red blood cell Count—5400000 in male &4700000 in female
Anemia--RBC’s counts are less than normal value
Polycythemia--- RBC’s count is more than normal
Life span of the RBC: average of 120 days in males & 110 days in females

22. Packed Cell Volume (PVC) or hematochrit (hcr)---volume of RBC’s in 100ml (dl) of blood.
in male is 47%female is 42%.
anemia PCV is less than normal while in Polycythemia RCB is greater than normal value
Hemolysis of RBC

24. Total blood Volume (TBV)
TBV = plasma volume + red cell volume
About 55% of this volume is plasma (3080 ml), and about 45% of this volume is packed cell volume (2520 ml).
TBV in the average adult is 4-5 L in female & 5-6 L in adult males.