A red blood cell is a sort of cell discovered within the blood.
The thousands and thousands of red blood cells within the circulation of vertebrates give blood its attribute colour and carry oxygen from the lungs to the tissues.
The grownup human red blood cell is small, spherical and double concave; seems in profile as a dumbbell.
The cell is versatile and takes the form of a bell because it passes by very small blood vessels. It is coated with a membrane of lipids and proteins, has no nucleus and accommodates hemoglobin.
The perform of the red cell and its hemoglobin is to hold oxygen from the lungs to all physique tissues and to hold carbon dioxide, a waste product of metabolism, to the lungs, the place it is excreted.
Though red cells are often spherical, a small variety of them are oval within the regular individual.
The variety of cells concerned and the quantity of hemoglobin range amongst completely different people and underneath completely different circumstances.
#red #blood #cell