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What are the main internal organs of the human body? Explain the functions of each internal organ?

there are so many organs in our body. Plz give the specific organs about which u want details
they are not allowing me to write !
any 4 main organ systems



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Brain -- located inside the cranial cavity or skull. Protected by the meninges. The most important internal organ in our body. Forms part of the central nervous system. Controls the activities of glands and other internal organs.

heart -- pumps blood and forms part of the circulatory system. It pumps oxygenated blood to all parts of the body and send the deoxygenated blood to the lungs.

lungs -- purifies deoxygenated blood received from the heart and sends the oxygenated blood to the heart. They are 2 in number.

kidneys -- a pair of bean shaped organs which form part of the excretory system . The functional and structural units if the kidney are called nephrons . Their main function is to absorb nutrients and to eliminate wastes like urea, uric acid and creatinine.

stomach -- forms part of the digestive system. The main process of digestion takes place here. It's capacity of food or chyme is 1.8 liters.

liver -- it is the largest gland. It secretes bile. Bile is a yellowish green liquid which contains bile salts and cholesterol.

sex organs -- the uterus, ovaries in the female and the testes in males are extremely important for the processes of reproduction .
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Liver helps in the formation of useful juices.....stomach helps in digestion.....rectum and anus helps in excretion.....lungs help in respiration......heart helps in conduction of blood.....mouth helps in intaking of food.
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