Main Organs of Human Body

Main Organs:

Heart: The heart is situated in the centre of the thorax ,just behind the breast the breast bone-sternum and is enclosed in a tough membrane called the pericardium. Its average weight is about 340 grams in men and 225 grams in women. Contraction and relaxation mechanism of ventricles results  a heart beat of 70-72/min in males and 78-82/ min in females. Contraction of ventricles is called systole and relaxation is called diastole. Circulation of blood in the body is regulated by heart.

Lungs :  A pair of spongy organs consisting of elastic tissues situated in the chest cavity. There are two lungs, the right lung is larger than the left lung. Together they weight upto 1.18 and 1.19 kg in a health adult. Their main function is to purify blood and supply Oxygen to it. The entire blood supply (4.5 to 5 litres) washes through the lungs about once a minute.

Liver : The Liver situated on the right side of the stomach is the largest gland in the human body. It weights around  8812 grams. The gall bladder is attached to the liver and stores bile produced by it. The liver is responsible for the metabolism of the products of digestion, storage and release of substances (principally glucose) so as to maintain constant level in the blood.

Kidneys: The two kidneys are situated in the upper posterior of the abdominal cavity, one on each side of vertebral column. Each kidney is approximately 10 cm long, 5 cm wide and 2.5 cm thick. They filter nitrogenous waste of the body from the blood and throw it out in the form of urine.

Human Brain : Consist of two parts : The brain located in the skull and the spinal cord located in the vertebral column.

The weight of average human brain triples between birth and adulthood. The final weight of a brain in an adult male is about 1.4 kg and 1.3 kg in case of woman) which averages about 3 % of body weight.

The Human brain uses about 20 % of the oxygen a man breathes, 20 % of calories a man takes in and 15 % of body blood.