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🚰 C26. Urinary System
2. Physiological Anatomy of the Kidneys
2.1 General organization of the Kidneys
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Cards (25)
Where do the two kidneys lie in the body?
On the
posterior
wall of the abdomen
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What is the average weight of an adult human kidney?
About
150 grams
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What is the hilum of the kidney?
An
indented
region for
blood vessels
and
ureter
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What does the ureter do?
Carries final urine from
kidney
to
bladder
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What surrounds the kidney for protection?
A tough,
fibrous
capsule
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What are the two major regions of the kidney?
Outer cortex
and
inner medulla
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How many renal pyramids are typically found in the medulla?
8 to 10
cone-shaped masses
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Where does the base of each renal pyramid originate?
At the border between
cortex
and
medulla
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What is the function of the renal pelvis?
It collects
urine
from the
calyces
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What are the major calyces?
Open-ended pouches in the
renal pelvis
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What do the minor calyces do?
Collect urine from the
tubules
of each
papilla
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How do the walls of the calyces, pelvis, and ureter function?
They
contain
contractile
elements
to
propel
urine
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What percentage of cardiac output do the kidneys receive?
About
22 percent
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What is the normal renal blood flow rate?
1100
ml/min
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What branches does the renal artery form after entering the kidney?
Interlobar
,
arcuate
, interlobular arteries
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What is the role of the glomerular capillaries?
Filter large amounts of
fluid
and solutes
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What do the efferent arterioles lead to?
A second capillary network, the
peritubular capillaries
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How is the renal circulation unique?
It has two
capillary beds
in series
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What regulates hydrostatic pressure in the renal capillaries?
Afferent and efferent arterioles
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What is the hydrostatic pressure in the glomerular capillaries?
About
60 mm Hg
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What is the hydrostatic pressure in the peritubular capillaries?
About
13 mm Hg
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How do kidneys respond to body homeostatic demands?
By adjusting resistance of
arterioles
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Where do the peritubular capillaries empty into?
Vessels of the
venous system
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What veins progressively form the renal vein?
Interlobular
,
arcuate
,
interlobar
veins
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Where does the renal vein leave the kidney?
Beside the
renal artery
and
ureter
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