Reabsorption

Definition

Reabsorption is the process by which the kidneys filter out waste and excess substances from the blood and then return necessary nutrients and water back into the bloodstream. It plays a crucial role in maintaining homeostasis, particularly in fluid balance and electrolyte levels.

5 Must Know Facts For Your Next Test

1. Reabsorption occurs mainly in the proximal convoluted tubule of the nephron.
2. It allows for the recovery of glucose, amino acids, sodium ions, and water from the filtrate back into the blood.
3. Hormones such as aldosterone and antidiuretic hormone (ADH) regulate reabsorption processes.
4. Impaired reabsorption can lead to conditions like dehydration or electrolyte imbalances.
5. Effective reabsorption is essential for maintaining blood pressure and overall renal function.

Review Questions

• Where does reabsorption primarily occur within the nephron?
• Name two hormones that regulate the process of reabsorption.
• What are potential health issues that can arise from impaired reabsorption?

Related terms

Filtration: One of the initial steps in urine formation where blood plasma is filtered through the glomerulus.

Secretion: The transfer of materials from peritubular capillaries to renal tubular lumen, aiding in waste removal.

Homeostasis: The body's ability to maintain a stable internal environment despite external changes.