Red blood cell

 

  

The human red blood cell is a flattened biconcave disc of about 6-7m in diameter.  It is reddish in color and imparts the red color to be blood. Hence its name- red blood cell.  It contains the pigment hemoglobin (Hb) which is responsible for  the redness of the corpuscle.  Hemoglobin has a respiratory function in being able to combine with oxygen (O2) to form a compound called oxyhemoglobin.

            Oxyhemoglobin releases its contained oxygen to tissues in the region of low oxygen tension.

            The red cell has a central darkly stained area which may be mistaken for nucleus.  However the human red blood cells are nonnucleated.  The human red blood cell consists of prominent plasma membrane which has the capacity to change its form in relation to anatomical and physiological situations.  The membrane is semipermeable but it is impermeable to large molecules including hemoglobin, which the cells contain.  The membrane changes its shape in conditions of blood hyper or hypotonicity.  It also changes its shape in the process known as diapedisis which is a condition in which the redbcell moves through capillary endothelial spaces into tissue fluid, and change shape to accommodate itself in the tight spaces in inflammatory conditions.  The red blood cell is devoid of Golgi apparatus and endoplasmic reticulum

      Red cell genelogy

 

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