Functions of Kidney -
- The kidneys remove a number of waste products and get rid of them in the urine.
- The kidneys reabsorb nutrients from the blood and transport them to the desired place.
- They also reabsorb other products to help maintain homeostasis.
- In humans, the acceptable pH level is between 7.38 and 7.42. Below this boundary, the body enters a state of acidemia, and above it, alkalemia. The kidneys manage the pH through two processes:
- Reabsorbing and regenerating bicarbonate from urine
- Excreting hydrogen ions and fixed acids
- In response to ADH, the kidney performs osmolality regulation such as increasing urine concentration, increasing water reabsorption, reopening portions of the collecting duct that water cannot normally enter, allowing water back into the body, retaining urea in the medulla of the kidney rather than excreting it, as it draws in water.
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Perfusion refers to a process of passage of blood or some other fluid in organs and tissues. It is not a renal function. Hence, the correct option is perfusion
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