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Excretion in human Video Lecture - Class 6

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1. What is excretion in humans?
Ans. Excretion in humans is the process by which waste products and harmful substances are removed from the body. It involves the elimination of metabolic waste, such as carbon dioxide, urea, and excess water through various excretory organs.
2. Which organs are involved in the excretion process in humans?
Ans. The major organs involved in the excretion process in humans are the kidneys, lungs, liver, and skin. The kidneys filter waste products from the blood and produce urine. The lungs eliminate carbon dioxide through the process of respiration. The liver detoxifies harmful substances and metabolizes drugs. The skin helps in the elimination of sweat and certain waste products.
3. How do the kidneys play a crucial role in excretion?
Ans. The kidneys play a crucial role in excretion by filtering waste products from the blood and producing urine. They remove excess water, urea, toxins, and other waste substances from the body. The urine then travels through the ureters to the bladder, where it is stored until it is eliminated from the body through the urethra.
4. What is the importance of excretion in maintaining homeostasis?
Ans. Excretion is important for maintaining homeostasis, which is the body's ability to maintain a stable internal environment. By eliminating waste products and harmful substances, excretion helps in regulating the balance of water, electrolytes, and pH levels in the body. It also helps in removing toxins and maintaining the proper functioning of various organs and systems.
5. How does the skin contribute to the excretion process in humans?
Ans. The skin contributes to the excretion process in humans through the elimination of sweat and certain waste products. Sweat contains water, salts, urea, and other substances, which are excreted through sweat glands on the skin's surface. This process helps in regulating body temperature and removing waste substances from the body.
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