Selective Reabsorption in the Kidneys Flashcards

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What is selective reabsorption in the kidneys?

Selective reabsorption is when useful substances are taken back from the kidney tubule into the blood.

Where in the nephron does most selective reabsorption happen?

Most selective reabsorption happens in the proximal convoluted tubule of the nephron.

Name three substances that are reabsorbed from the filtrate back into the blood.

Glucose, some mineral ions, and most of the water are reabsorbed back into the blood.

Why is the process called ‘selective’ reabsorption?

It is called selective because only useful substances, in the right amounts, are taken back into the blood.

What happens to glucose during selective reabsorption in a healthy kidney?

In a healthy kidney, all the glucose in the filtrate is reabsorbed back into the blood.

What type of transport is used to reabsorb glucose into the blood?

Glucose is reabsorbed by active transport, which uses energy from respiration in the tubule cells.

How is water reabsorbed from the kidney tubule back into the blood?

Water is reabsorbed by osmosis, following dissolved substances like glucose and ions into the blood.

What happens to substances that are not reabsorbed in the kidney tubules?

Substances that are not reabsorbed stay in the tubule and are removed from the body in urine.

How are cells in the proximal convoluted tubule adapted for selective reabsorption?

They have many mitochondria for energy and a large surface area to speed up reabsorption.

Why is selective reabsorption important for the body?

It stops useful substances being lost in urine and helps keep water and ion levels in balance.