What are peritubular capillaries?

Peritubular capillaries are located next to nephrons, the main work parts of the kidney. These capillaries are very small blood vessels and are an important part of the urinary path. As blood leaves the kidneys, minerals and ions are reabsorbed through the capillaries back into the blood. Reabsorption occurs with transcytosis, passive transport or active transport. Ions that are not needed are excreted in capillaries and sent to the bladder. These capillaries are completely surrounded by tubules that contain all the fluids and particles that have been removed from the blood. Thanks to the peritubular capillaries, the important nutrients that the body needs, reabsorbed back into the blood.

Active transport of minerals via capillaries uses ions. The collection of ions across capillary membranes is created by an aconcentration gradient. The ions are then transported through the membrane and pass from the area of ​​high concentration to the low concentration area. The ecTochemical gradient occurs when a high concentration of ions accumulates in the tubule. IonY passes through the membrane using ion channels or ion pumps.

Transcytosis is essential for reabsorbing macromolecules into the blood. Macromolecule is a very large molecule or a compound that cannot easily pass through the cell membranes. Transcytosis uses vesicles for transporting molecules. The vesicle containing macromolecule is formed on one side of the cell. It travels through a cell and excludes macromolecule to a neighboring cell.

The third reabsorption method is passive transport. Passive transport function based on the permeability of the membrane and does not use chemical energy. The concentration of minerals in tubules is high concentration in capillaries is low. Through passive transport, minerals move to peritubular capillaries. The transport stops when the concentration of minerals in capillaries is the same as concentration in tubules.

Specifically, the ions of water and mineral ions are reabsorbNY through peritubular capillaries. About 80 percent of all ions and water that the body needs is absorbed at this point. This blood rich in minerals then moves into the veins and travels throughout the body.

Any item that is not absorbed through peritubular capillaries moves into the loop Henle. The water is removed from excess minerals and nutrients and creates concentrated urine. Concentrated urine moves into the bladder and finally from the body.