Ch26_Urinary

Ch26_Urinary - Urinary system Functions of the urinary...

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Urinary system
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Functions of the urinary system • Micturition-(removal of metabolic wastes) • Regulate ionic concentration of plasma by controlling the amount lost in the urine • pH balance-removal of ammonia for body fluids • Regulates blood volume/pressure by controlling the amount of urine produced • Stimulates erythrocyte production • Conserves valuable nutrients
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Removal of wastes from the body • The urinary system maintains homeostasis of the blood concentration, volume, pressure, pH and removes toxins. • Functional unit of the kidney is the nephron • 1.25 million nephrons per kidney
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Fig 26.1 The urinary system is located in the abdominal pelvic cavity Kidneys and ureters are in the retroperitoneal space
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Kidneys • Located between T12 and L-3 • Right kidney lower than left (liver in the way) • Located retroperitoneal • Renal Capsule-collagen fibers on surface of kidney • Perirenal fat-helps protect kidneys, adipose tissue • Renal Fascia -Anchored to back abdominal wall – Runs from capsule through fat to wall
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Fig 26.2 The right kidney is inferior to the left
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Fig 26.1 Connective tissue holds the kidneys in place against the posterior body wall
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Anatomy of the kidney • Renal Cortex-Superficial region • Renal Medulla-deeper region – Similar idea to adrenal cortex and medulla
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Fig 26.3
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Blood flow to & from the kidneys FYI Aorta Inferior vena cava
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Fig 26.4 Segmental arteries lead to each lobe
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This note was uploaded on 11/10/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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Ch26_Urinary - Urinary system Functions of the urinary...

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