Peritubular capillary network

Definition

The peritubular capillary network is a system of tiny blood vessels that surrounds the renal tubules in the kidney. It plays a crucial role in reabsorbing substances from the filtrate back into the bloodstream and secreting waste products into the tubule for excretion.

5 Must Know Facts For Your Next Test

1. Peritubular capillaries primarily arise from the efferent arterioles of the glomerulus.
2. They are essential for reabsorption of water, electrolytes, and nutrients from the filtrate.
3. These capillaries help maintain acid-base balance by reabsorbing bicarbonate and hydrogen ions.
4. They work closely with renal tubules to secrete additional waste products into the tubular fluid.
5. Peritubular capillary exchange is driven by osmotic and hydrostatic pressures.

Related terms

Glomerulus: The network of capillaries in the kidney where blood filtration begins.

Renal Tubule: The structure in the nephron where filtered fluid passes through and undergoes reabsorption and secretion.

Efferent Arteriole: The blood vessel carrying blood away from the glomerulus, leading to peritubular capillaries.