UNIT 3 - Tinamad Flashcards
○ paired, bean shaped that lies outside the peritoneal cavity
○ body’s main excretory organ
○ selectively reabsorbs substances to maintain the normal composition of the blood
Kidneys
○ Maintain blood volume and pressure
○ Ensure balance of sodium, chloride,
potassium, calcium, hydrogen, phosphate,
and pH
○ Eliminate products of metabolism (urea, uric
acid, creatinine)
Kidneys
How many lobes does the kidney composed of?
18 lobes
each of the 18 lobes of the kidney is composed of
nephrons
■ high pressure mass of capillaries (tuft), that filters the blood
■ encased in a Bowman’s Capsule
Glomerulus
Glomerular Filtration Membrane
■ Epithelium
■ Basement Membrane
■ Epithelial Podocytes
■ the fluid that is filtered from the
capillary blood into the Bowman’s
Space
■ forms the primary urine
Filtrate
■ within these, some substances are
added to the filtrate as part of the
urine formation
■ some are reabsorbed out of the
filtrate and back into the blood
Tubules
● covers the PCT and DCT
● where reabsorption takes place
Peritubular Capillaries
● surround the Loop of Henle
● where concentration of urine takes place
Vasa Recta
■ supplies blood to the kidney
■ kidneys receive approximately 25%
of the blood pumped through the
heart at all times
Renal Artery
○ indention in the medial border of the
kidney
○ where the blood vessels, nerves and
ureter is connected to the kidney
HILUS
● highly coiled segment
● drains the Bowman’s Capsule
● where almost complete absorption of
nutritionally important substances takes
place
Proximal Convoluted Tubules
● reabsorbs water and ions form the urine
● controls urine concentration (exchange
of water and salts)
Loop of Henle
● regulates K+, Na+ and pH
● further dilution of urine takes place
Distal Convoluted Tubule
