tubules (kidney) – tiny tubes in nephrons that collect waste substances from blood and takes them away

(Pronounced tyoob-yool)

To remember the meaning of tubules (kidney), use the following mnemonic:

The tuba you'll (tubule) be playing has been pulled out of shape and used for collecting waste and taking it away.

Tubules are small, tube-like structures found within the kidney and are a crucial part of the nephrons (the functional unit of the kidneys). They are responsible for filtering blood and producing urine by performing selective reabsorption and secretion processes. As they pass through different sections of the tubules, useful substances like glucose, amino acids, water, and essential salts are reabsorbed back into the bloodstream, while waste products and excess substances are retained in the tubule to be excreted as urine. Parts of the tubule include the proximal tubule, loop of henle, bowman's capsule, collecting duct, and distil tubule, all working together to filter blood and reabsorb useful substances.

This is what a nephron is:

Here is a simple overview of the transfer of substances in the nephron.

This is what a tubule is: