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Excretory - Biology, General Science Video Lecture | Famous Books for UPSC Exam (Summary & Tests)
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FAQs on Excretory - Biology, General Science Video Lecture - Famous Books for UPSC Exam (Summary & Tests)
| 1. What is excretion in biology? |  |
Ans. Excretion in biology refers to the process by which waste products, toxins, and excess substances are eliminated from the body of an organism. It is a vital process that helps maintain homeostasis by removing harmful substances and maintaining proper balance within the body.
| 2. What are the main organs involved in the excretory system? | |
Ans. The main organs involved in the excretory system are the kidneys, lungs, skin, and liver. The kidneys filter waste products from the blood and produce urine. The lungs excrete carbon dioxide and water vapor during respiration. The skin excretes sweat, which contains water, salts, and small amounts of waste products. The liver processes and eliminates toxins from the body.
| 3. How do the kidneys function in excretion? | |
Ans. The kidneys are the primary organs responsible for excretion in the body. They filter waste products, excess water, and toxins from the blood to produce urine. The kidneys receive blood from the renal arteries, and within the kidneys, specialized structures called nephrons filter the blood. Nephrons reabsorb essential substances like water, glucose, and salts back into the bloodstream, while waste products and excess substances are eliminated in the form of urine.
| 4. What role does the liver play in excretion? | |
Ans. The liver plays a crucial role in excretion by processing and eliminating toxins from the body. It detoxifies harmful substances such as alcohol, drugs, and metabolic waste products. The liver also produces bile, which helps in the digestion and absorption of fats. Additionally, the liver excretes bilirubin, a waste product derived from the breakdown of old red blood cells, which is then eliminated in the form of bile.
| 5. How does the skin contribute to excretion? | |
Ans. The skin contributes to excretion through the production and elimination of sweat. Sweat contains water, salts, and small amounts of waste products such as urea. When the body temperature rises, sweat glands in the skin produce sweat, which evaporates and helps cool down the body. This process not only regulates body temperature but also eliminates certain waste products and toxins through the skin.
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