Here's a breakdown:
* Nephron: The functional unit of the kidney, responsible for filtering waste products from the blood.
* Lumen: The hollow space inside the nephron where the filtered fluid (filtrate) flows.
* Reabsorption: The process of moving substances from the filtrate back into the bloodstream.
During reabsorption, molecules like glucose, amino acids, and water pass through the walls of the nephron tubules and enter the surrounding capillaries. These capillaries then transport the reabsorbed molecules back into the general circulation.
This process is essential for maintaining the body's fluid and electrolyte balance and for preventing the loss of important nutrients.
