Sunday, August 9, 2009

Why Is Our Blood Red In Colour?


The blood, which flows though our body, contains many different materials and cells. Each part of the blood has its own specific function.

The liquid part of the blood is called ‘Plasma’ that makes up a little more than half the blood. It is light yellow in colour and thicker than water as many substances like protein, antibodies, fibrinogen that helps the blood to clot, carbohydrates, fats, salts and blood cells are dissolved in it.

The red blood corpuscles give the blood its colour. The red cells from adult cells in the bone marrow, forming more and more hemoglobin. Red cells live only for about three months and are broken up. New red cells are being continuously formed to replace the old ones.


Below Blood info from Wikipedia (

Blood is a specialized bodily fluid that delivers necessary substances to the body's cells — such as nutrients and oxygen — and transports waste products away from those same cells.

In vertebrates, it is composed of blood cells suspended in a liquid called blood plasma. Plasma, which comprises 55% of blood fluid, is mostly water (90% by volume),[1] and contains dissolved proteins, glucose, mineral ions, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), platelets and blood cells themselves. The blood cells present in blood are mainly red blood cells (also called RBCs or erythrocytes) and white blood cells, including leukocytes and platelets. The most abundant cells in vertebrate blood are red blood cells. These contain hemoglobin, an iron-containing protein, which facilitates transportation of oxygen by reversibly binding to this respiratory gas and greatly increasing its solubility in blood. In contrast, carbon dioxide is almost entirely transported extracellularly dissolved in plasma as bicarbonate ion.

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