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urinary Web - The Urinary System eliminates waste Some...

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The Urinary System eliminates waste . . . Some waste products of urine = Nitrogenous wastes (from protein breakdown) Extra electrolytes Certain toxins and drugs
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. . . to help regulate these very important things: Water balance Electrolytes Acid-base balance in the blood Blood pressure AND, kidneys also Manage RBC production (erythropoietin) Activate vitamin D DIGESTIVE SYSTEM RESPIRATORY SYSTEM CARDIOVASCULAR SYSTEM URINARY SYSTEM water, solutes elimination of excess water, salts, wastes
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Organs of the Urinary System Kidneys – primary functional organs! Ureters – drain urine to bladder Urinary bladder – store urine Urethra – drain urine from body These are really just fancy plumbing
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Kidneys are fairly well protected… Figure 15.1b Located against dorsal body wall Protected (somewhat) by lower ribs Anchored and protected (with fat) by 3 surrounding membranes
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Kidney Features Renal hilum – indentation where ureters and blood vessels enter/exit kidney Adrenal glands on top
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Regions of the Kidney Figure 15.2b Renal cortex— outer region Renal medulla— inside cortex Medullary pyramids and renal columns Renal pelvis— inner collecting tube (moves urine to ureters)
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Kidneys filter blood, i.e. control plasma composition 1/4 th of blood supply passes through kidneys per minute! Renal artery = arterial blood supply (to be filtered) Renal vein = filtered blood drainage Filtration occurs across capillaries = glomerulus in between
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Nephron = functional unit of kidney, i.e. actual site of urine formation
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