Which of the following is an excretory organ of the human body?
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Major excretory organs and their wastes:
Kidneys → Urine (urea, excess water, salts)
Lungs → Carbon dioxide, water vapor
Skin → Sweat (water, salts, small amount of urea)
Liver → Bile pigments
Large intestine → Feces
The question asks which organs in the human body function as excretory organs. The options given are: Kidney, Lungs, Skin, and All of these. The correct answer is 'All of these'. Let’s understand why each organ is considered an excretory organ:
Kidney: The primary function of the kidneys is to filter blood and remove waste products and excess substances, including urea, creatinine, and excess ions, from the bloodstream. These are excreted in the urine. This makes the kidneys a crucial component of the excretory system.
Lungs: The lungs are responsible for removing carbon dioxide, a gaseous waste product of cellular metabolism, from the body. Carbon dioxide is transported from the cells to the lungs, where it is expelled from the body during exhalation.
Skin: The skin excretes waste products through sweat glands. Sweat contains water, salts, and a small amount of urea. It helps in the regulation of body temperature and the excretion of waste substances.
Therefore, all the options mentioned (Kidney, Lungs, and Skin) play a role in the excretion of waste products from the human body.
Given this, the most inclusive and accurate answer is "All of these" because each of these organs—kidney, lungs, and skin—has specific excretory functions.
Understanding the roles of different excretory organs is crucial in comprehending how the body maintains homeostasis by eliminating waste products.
