What are Red Blood Cell – Definition, Normal Count & Morphology

Erythrocytes (RBC) Presentation / Essay on Normal Value, Shape & Size in a human body for Biology / Medical Students in Word/ .doc / .Pdf Format

RED BLOOD CELLS (RBC):-

INTRODUCTION AND NORMAL VALUE

Erythrocytes or red blood cells (RBC) are the non-nuc­leated formed elements in the blood. The red colour of these cells is due to the presence of the colouring matter-hemoglobin in these cells. The word erythros means red. The red blood cell count ranges between 4 and 5.5 millions per cubic millimeter of blood. In adult males it is 5 millions/cu mm of blood and in adult females it is 4.5 millions/cu mm of blood.

MORPHOLOGY OF RED BLOOD CELLS:-


NORMAL SIZE 

Diameter : 7.2 (6.9- 7.4 u).

Thickness : At the periphery it is thicker with 2.2 μ and at the center it is thinner with 1μ. The difference in thickness is because of the biconcave shape.

Surface area : 120 square μ.

Volume : 85-90 cubic μ.


NORMAL SHAPE

Normally, the red blood cells are disc shaped and bicon­cave (dumb-bell shaped). The biconcave contour of red blood cells has the following mechanical advantages.

1. It helps in equal and rapid diffusion of oxygen and, other substances into the interior of the cell.

2. Large surface area is provided for absorption removal of different substances.

3. Minimal tension is offered on the membrane when the volume of cell alters.

4. While passing through minute capillaries, these cells can squeeze through the capillaries very easily.

Download Notes on Red Blood Cell in Word Format

No comments:

Post a Comment