2.1 General organization of the Kidneys

Cards (25)

  • Where do the two kidneys lie in the body?
    On the posterior wall of the abdomen
  • What is the average weight of an adult human kidney?
    About 150 grams
  • What is the hilum of the kidney?
    An indented region for blood vessels and ureter
  • What does the ureter do?
    Carries final urine from kidney to bladder
  • What surrounds the kidney for protection?
    A tough, fibrous capsule
  • What are the two major regions of the kidney?
    Outer cortex and inner medulla
  • How many renal pyramids are typically found in the medulla?
    8 to 10 cone-shaped masses
  • Where does the base of each renal pyramid originate?
    At the border between cortex and medulla
  • What is the function of the renal pelvis?
    It collects urine from the calyces
  • What are the major calyces?
    Open-ended pouches in the renal pelvis
  • What do the minor calyces do?
    Collect urine from the tubules of each papilla
  • How do the walls of the calyces, pelvis, and ureter function?
    They contain contractile elements to propel urine
  • What percentage of cardiac output do the kidneys receive?
    About 22 percent
  • What is the normal renal blood flow rate?
    1100 ml/min
  • What branches does the renal artery form after entering the kidney?
    Interlobar, arcuate, interlobular arteries
  • What is the role of the glomerular capillaries?
    Filter large amounts of fluid and solutes
  • What do the efferent arterioles lead to?
    A second capillary network, the peritubular capillaries
  • How is the renal circulation unique?
    It has two capillary beds in series
  • What regulates hydrostatic pressure in the renal capillaries?
    Afferent and efferent arterioles
  • What is the hydrostatic pressure in the glomerular capillaries?
    About 60 mm Hg
  • What is the hydrostatic pressure in the peritubular capillaries?
    About 13 mm Hg
  • How do kidneys respond to body homeostatic demands?
    By adjusting resistance of arterioles
  • Where do the peritubular capillaries empty into?
    Vessels of the venous system
  • What veins progressively form the renal vein?
    Interlobular, arcuate, interlobar veins
  • Where does the renal vein leave the kidney?
    Beside the renal artery and ureter