Formed Elements of blood, Red Blood Cell

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Formed Elements of blood

There are three types of cellular elements in the blood which constitute about 45% of the blood i.e

i. red blood corpuscles (R.B.C) or erythrocytes.

ii. White blood corpuscles (W.B.C) or leukocytes

iii. Platelets or thrombocytes

These are collectively known as formed aliments of the blood.

Red blood Corpuscles (R.B.C):-

(R.B.C's are also known as erythrocytes). They canto no nucleic acid or mitochondria and can reproduce R.B.C' have a little aerobic metabolic and have no protein, fat or carbohydrate synthetics activity. These substances and function are lost where normoble and reticuloblast are converted into mature re blood cells.

Shape:-

The mature human or mammalian red blood cells camel are circular , biconvex in shape and lack nucleus. In came they are oval in shape.

In mammalian vertebrates red cells are oval, biconvex and nucleated. In foctus. They are nucleated but in later part the nucleated cells disappear from the circa the edges are rounded and thicker then the center and looks like dumb-bell from the side.

Size:-

Red blood cells are 7.5 um in diameter 7.2u

1.1 um in thickness

1 um in the centre

7.2 u means diameter.

Composition of R.B.C:-

Each red blood cell contains

1. Water-----65%

2. Solid-----35%

A) Solid Portion 35% contains:-

The solid portion contains,

i. Hemoglobin -----33%

ii 2% of phospholipids, cholesterol, cholesterol aster, amino acid and proteins.

iii. But very small amount of Urea, Uric acid Phosphate are also present

B) Total lipids of R.B.C:-

Total lipids,

i. Phospholipids -----60%

ii. Free Cholesterol -----30%

iii. Fat and cholesterol aster -----10%

of the salts in the corpuscles potassium phosphate is the chief salt.