Blood consists of plasma (a fluid medium) in which cells are suspended.
Veins are the vessels which collect blood from different organs and bring it back to the heart.
Arteries are the vessels which carry blood away from the heart to various organs of the body.
Arteries have thicker walls than veins.
Arteries divide into thinner vessels (one cell thick) called capillaries on reaching organs. Capillaries then join to form veins.
Platelet cells stop blood leakage by clotting blood at points of injury.
The Heart: Human heart is as big as fist.
- Plasma transports food, carbon dioxide and nitrogenous wastes.
- Oxygen is carried by red blood cells (RBC).
Veins are the vessels which collect blood from different organs and bring it back to the heart.
Arteries are the vessels which carry blood away from the heart to various organs of the body.
Arteries have thicker walls than veins.
Arteries divide into thinner vessels (one cell thick) called capillaries on reaching organs. Capillaries then join to form veins.
Platelet cells stop blood leakage by clotting blood at points of injury.
The Heart: Human heart is as big as fist.
On left side of heart, Blood from lungs (rich in O2) is received at left atrium, transferred to left ventricle and then pumped out to the entire body.
On right side of heart, Blood from the entire body (rich in CO2) is received at right atrium, transferred to right ventricle and then pumped out to the lungs.
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