Peritubular capillaries
Encyclopedia
In the renal system, peritubular capillaries are tiny blood vessels that travel alongside nephrons allowing reabsorption and secretion
between blood and the inner lumen of the nephron.
Ions and minerals that need to be saved in the body are reabsorbed into the peritubular capillaries through active transport
, secondary active transport, or transcytosis
.
The ions that need to be excreted as waste are secreted from the capillaries into the nephron to be sent towards the bladder
and out of the body.
The majority of exchange through the peritubular capillaries occurs because of chemical gradients, osmosis
and Na+ pumps.
Secretion
Secretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland. In contrast to excretion, the substance may have a certain function, rather than being a waste product...
between blood and the inner lumen of the nephron.
Ions and minerals that need to be saved in the body are reabsorbed into the peritubular capillaries through active transport
Active transport
Active transport is the movement of a substance against its concentration gradient . In all cells, this is usually concerned with accumulating high concentrations of molecules that the cell needs, such as ions, glucose, and amino acids. If the process uses chemical energy, such as from adenosine...
, secondary active transport, or transcytosis
Transcytosis
Transcytosis is the process by which various macromolecules are transported across the interior of a cell. Vesicles are employed to intake the macromolecules on one side of the cell, draw them across the cell, and eject them on the other side. While transcytosis is most commonly observed in cells...
.
The ions that need to be excreted as waste are secreted from the capillaries into the nephron to be sent towards the bladder
Urinary bladder
The urinary bladder is the organ that collects urine excreted by the kidneys before disposal by urination. A hollow muscular, and distensible organ, the bladder sits on the pelvic floor...
and out of the body.
The majority of exchange through the peritubular capillaries occurs because of chemical gradients, osmosis
Osmosis
Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides...
and Na+ pumps.