Why blood is Red?
Blood is red because most of its cells are packed with a red-coloured substance called haemoglobin. Using this, the red blood cells pick up vital oxygen and deliver it to the body's cells. To archive this and other roles, such as removing waste, blood is pumped along blood vessels by the heart.
Blood composition:
If blood is poured into a glass tube and spun in a components separate into three layers.
Plasma (55%): A watery liquid containing food, waste, hormones, and many other substance.
White blood cells and platelets (1%): White blood cells fight infection, and platelets prevent bleeding by causing blood clots.
Red blood cells (44%): Transport oxygen from lungs to tissue.
Blood circulation:
Blood travels through blood vessels, from the heart, to all parts of the body. Oxygen-poor blood (blue) is pumped to the lungs, where it picks up oxygen. This oxygen-rich blood (red) is then pumped to the rest of the body.
How Blood pump through your heart:
Your heart is mainly made up of a special kind of muscle that never tires. It has two sides - left and right - each divided into an upper chamber called an atrium, and a larger, lower chamber called a ventricle.
1. Recive oxygen-poor blood from the body into your right atrium.
2. Push the blood down into your right ventricle, through the tricuspid valves which prevent any backflow.
3. From your right ventricle, pump the blood to your lungs.
4. Receive the oxygen-enriched from the lungs into your left atrium.
5. From your left ventricle, pump the oxygen-rich blood to the body.
Facts: More than 2,300 years ago, Greek philosopher Aristotle started that the heart was the part of the body that makes up feel emotions. Today we know the brain is responsible for the way we feel but, although Aristotle's ideas are long gone, people still express their love with hearts on 14th feb Valentines day.
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