Question Video: Recalling the Function of the Proximal Convoluted Tubule | Nagwa Question Video: Recalling the Function of the Proximal Convoluted Tubule | Nagwa

Question Video: Recalling the Function of the Proximal Convoluted Tubule Biology • Second Year of Secondary School

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Complete the table to correctly relate the structures of a nephron to their functions.

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Video Transcript

Complete the table to correctly relate the structures of a nephron to their functions. (A) Encourages the diffusion of glucose into the nephron. (B) Selectively reabsorbs ions and water. (C) Forms urea and then urine from waste amino acids. Or (D) transports blood back to the glomerulus.

Nephrons are microscopic structures found within the kidneys. The kidneys are incredibly important organs that form part of our excretory systems. The primary functions of the kidneys are to filter blood and remove the waste products as urine.

To answer this question, let’s briefly recap how the thousands of nephrons found within the kidneys help the kidneys function by producing urine. In the first stage, blood that enters the kidneys via the renal artery is filtered. Substances like water, glucose, urea, and salt move from the capillaries of the kidney and into the Bowman’s capsule of the nephron. Then, selective reabsorption occurs in the proximal, or first, convoluted tubule. This is where useful products, like glucose, some ions, and water if needed, are reabsorbed back into the blood.

Finally, the waste products are emptied into the collecting ducts of the nephron to form urine. The collecting ducts transport urine to the ureter, which is the tube that connects the kidneys and the bladder. Urine is stored in the bladder until it is ready to be excreted.

Let’s look back at our question. We are asked to complete the table by giving the function of the proximal convoluted tubule. We now know this is where selective reabsorption of useful products back into the bloodstream occurs. So our correct answer is given by choice (B). The proximal convoluted tubule selectively reabsorbs ions and water.

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