Main function of kidney isa)Passive absorptionb)Ultrafiltrationc)Selective reabsorptiond)All of the aboveCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

The kidneys are a very important organ in the body. They are two bean-shaped organs, each about the size of a fist, located just below the rib cage, one on each side of your spine. The kidneys are responsible for getting rid of waste products, drugs, and toxins through our urine.

your kidney also

Regulate electrolyte (salt) concentrations
Regulate amount of fluid within the body
Help regulate blood pressure
Help maintain acid-base balance
Produce hormones that affect blood and bones
A kidney is composed of tiny units called nephrons
Nephrons consist of glomeruli and tubules
Glomeruli are small blood vessels that filter wastes and excess fluids
Tubules collect the waste to form urine

Answer

I think in 1st option it should be ' passive reabsorption ' ! there is no absorption in kidney , it's just reabsorption! Ok Your Answer , Each Kidney has large number of nephrons ! Some substances in the initial filtrate, such as glucose, amino acids , salts and major amount of water , are selectively re - absorbed as the urine flows along the tube ! And ultrafiltration is aslo the function of kidney as In renal physiology, ultrafiltration occurs at the barrier between the blood and the filtrate in the glomerular capsule (Bowman's capsule) in the kidneys. As in nonbiological examples of ultrafiltration, pressure (in this case blood pressure) and concentration gradients lead to a separation through a semipermeable membrane (provided by the podocytes). The Bowman's capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through the afferent arterioles and leaves through the efferent arterioles! ! !

Answer

Answer

Ultrafiltration and reabsorption in the kidney are carried out by its functional unit called nephron. Ultrafiltration occurs between the glomerulus and Bowman's capsule of the nephron.

Ultrafiltration, selective reabsorption, and passive absorption all occur in the kidneys during the process of urine formation specifically in the nephron.

Ultrafiltration means the diffusion of blood, including plasma to nephron to be filtered. Red blood cells and plasma protein cannot pass through ultrafiltration membrane because their size is too big.

Reabsorption includes the active and passive transport. Water is absorbed by osmosis or via aquaporin. Ions (e.g:Na+) is reabsorbed by active transport while glucose, amino acids, and small hydrophobic molecule can reabsorb by diffusion or facilitated diffusion. The process of reabsorption occurs in the renal tubule.

Answer

Main function of kidney:

The main function of the kidney is to maintain the balance of water and electrolytes in the body by filtering the blood and producing urine. The kidney performs several important processes to achieve this, including passive absorption, ultrafiltration, and selective reabsorption.

1. Passive absorption:
Passive absorption refers to the movement of substances across cell membranes without the use of energy. In the kidney, passive absorption occurs in the renal tubules. As the filtered blood passes through the tubules, certain substances such as water, glucose, amino acids, and ions are reabsorbed back into the bloodstream. This process helps to maintain the body's fluid and electrolyte balance.

2. Ultrafiltration:
Ultrafiltration is the process by which blood is filtered in the kidney to remove waste products and excess water. It takes place in tiny structures called nephrons, which are the functional units of the kidney. Within each nephron, there is a glomerulus, a network of capillaries surrounded by a Bowman's capsule. Blood pressure forces plasma, along with small molecules, through the capillary walls and into the Bowman's capsule. This filtrate contains water, electrolytes, waste products, and some useful substances.

3. Selective reabsorption:
Selective reabsorption is the process by which certain substances in the filtrate are reabsorbed back into the bloodstream. This occurs in the renal tubules, where specialized cells actively transport specific substances from the tubules back into the blood. For example, glucose and amino acids are actively reabsorbed, while water and electrolytes are reabsorbed passively based on osmotic gradients. This process helps to conserve valuable substances and maintain the body's homeostasis.

Conclusion:
In summary, the main function of the kidney is to filter the blood and regulate the composition of urine. This is achieved through processes such as passive absorption, ultrafiltration, and selective reabsorption. These functions are essential for maintaining the body's fluid and electrolyte balance and eliminating waste products from the body.

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