peri-tubular capillaries

(noun)

The capillaries through which components of filtrate are reabsorbed from the lumen of the nephron.

Related Terms

  • Bowman's capsule
  • tubular fluid
  • NA+/K+ ATPase
  • urine

Examples of peri-tubular capillaries in the following topics:

  • Tubular Reabsorption

    • Tubular reabsorption is the process by which solutes and water are removed from the tubular fluid and transported into the blood.
    • Reabsorbed fluids, ions, and molecules are returned to the bloodstream through the peri-tubular capillaries, and are not excreted as urine.
    • The mechanisms of reabsorption into the peri-tubular capillaries include:
    • These processes involve the substance passing though the luminal barrier and the basolateral membrane, two plasma membranes of the kidney epithelial cells, and into the peri-tubular capillaries on the other side.
  • Bulk Flow: Filtration and Reabsorption

    • Bulk flow is used by small, lipid-insoluble solutes in water to cross the the capillary wall and is dependent on the physical characteristics of the capillary.
    • Continuous capillaries have a tight structure reducing bulk flow.
    • Fenestrated capillaries permit a larger amount of flow and discontinuous capillaries allow the largest amount of flow.
    • Proteins and other large molecules are filtered out of the oxygenated blood in the glomerulus and pass into Bowman's capsule and the tubular fluid contained within.
    • Tubular reabsorption is the process by which solutes and water are removed from the tubular fluid and transported into the blood.
  • Tubular Secretion

    • Hydrogen, creatinine, and drugs are removed from the blood and into the collecting duct through the peritubular capillary network.
    • Tubular secretion is the transfer of materials from peritubular capillaries to the renal tubular lumen; it is the opposite process of reabsorption.
    • Passive diffusion—the movement of molecules from the peritubular capillaries to the intersitial fluid within the nephron.
    • The substances that are secreted into the tubular fluid for removal from the body include:
    • The tubular secretion of H+ and NH4+ from the blood into the tubular fluid is involved in blood pH regulation.
  • Renal Clearance

    • Clearance is a function of glomerular filtration, secretion from the peritubular capillaries to the nephron, and reabsorption from the nephron back to the peritubular capillaries.
    • Renal clearance depends mainly on GFR, tubular absorption, and tubular secretion.
    • Increased tubular secretion will increase clearance, while decreased tubular secretion will decrease clearance.
    • Increased tubular reabsorption will decrease clearance, while increased tubular reabsorption will increase clearance.
  • Kidney Function and Physiology

    • First, the nephrons filter blood that runs through the capillary network in the glomerulus .
    • Most of the solutes are reabsorbed in the PCT by a process called tubular reabsorption.
    • The formation of urine occurs through three steps: glomerular filtration, tubular reabsorption, and tubular secretion.
    • Tubular reabsorption occurs in the PCT part of the renal tubule.
    • Additional solutes and wastes are secreted into the kidney tubules during tubular secretion, which is the opposite process to tubular reabsorption.
  • Glomerular Filtration

    • Glomerular filtration is the renal process whereby fluid in the blood is filtered across the capillaries of the glomerulus.
    • It describes the process of blood filtration in the kidney, in which fluid, ions, glucose, and waste products are removed from the glomerular capillaries.
    • Blood plasma enters the afferent arteriole and flows into the glomerulus, a cluster of intertwined capillaries.
    • These then leave the glomerulus through the efferent arteriole, which becomes capillaries meant for kidney–oxygen exchange and reabsorption before becoming venous circulation.
    • A diagram showing the afferent and efferent arterioles bringing blood in and out of the Bowman's capsule, a cup-like sac at the beginning of the tubular component of a nephron.
  • Glomerular Diseases

    • The nephron is a tubular structure in the kidney that filters blood to form urine.
    • The glomerulus, a network (tuft) of capillaries, is located at the beginning of the nephron, and performs the first step of filtering blood.
    • The blood is filtered through the capillaries of the glomerulus into the Bowman's capsule.
    • Unlike most other capillary beds, the glomerulus drains into an efferent arteriole rather than a venule.
    • This, in turn, aids the process of ultrafiltration, where fluids and soluble materials in the blood are forced out of the capillaries and into Bowman's capsule.
  • Appendicitis

    • On the basis of experimental evidence, acute appendicitis seems to be the end result of a primary obstruction of the appendix lumen (the inside space of a tubular structure).
    • Peri appendicitis, inflammation of tissues around the appendix, is often found in conjunction with other abdominal pathology.
  • Yolk Sac Development

    • After circulating through a wide-meshed capillary plexus, it is returned by the vitelline veins to the tubular heart of the embryo.
  • Skin, Gills, and Tracheal Systems

    • A dense network of capillaries lies just below the skin, facilitating gas exchange between the external environment and the circulatory system.
    • These openings connect to the tubular network, allowing oxygen to pass into the body, regulating the diffusion of CO2 and water vapor .
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