The Urinary System Functions of the Urinary System
- Slides: 12
The Urinary System
Functions of the Urinary System n n Elimination of waste products n Nitrogenous wastes n Toxins n Drugs Regulate aspects of homeostasis n Water balance n Electrolytes n Acid-base balance in the blood n Blood pressure n Releases erythropoietin
Urinary System • Two Kidneys – Perform all filtering functions (but not excretion) • Two Ureters – Bring urine from Kidneys to Urinary Bladder • Urinary Bladder – Holds Urine until excretion – Can stretch • Urethra – Moves urine from bladder to outside of body
kidneys Organs of the Urinary System ureters urinary bladder urethra
Kidney Location Against the dorsal body wall (retroperitoneal) n Superior dorsal region (T 12 to L 3) n The right kidney is slightly lower than the left (due to position of the liver) n *An adrenal gland sits atop each kidney
Kidney Anatomy (External) n Renal hilum (hilus- singular) n A medial indentation where several structures enter or exit the kidney (ureters, renal artery, renal vein)
Coverings of the Kidneys n Renal Capsule n n Perirenal fat capsule n n Surrounds each kidney Surrounds the kidney and cushions against blows Renal fascia n Outermost capsule that helps hold the kidney in place against the muscles of the trunk wall
Regions of the Kidney(Internal) Renal cortex—outer region n Renal medulla—inside the cortex n Renal pelvis—inner collecting tubes, lead to the ureter n
Internal Kidney Structures n n n Renal or medullary pyramids -triangular shaped striped regions of tissue in the medulla Calyx(ces) -cup-shaped structures, drain urine from pyramids into pelvis Renal columns extensions that separate the pyramids in the medulla
Figure 15. 2 b
Blood Supply n One-quarter of the total blood supply of the body passes through the kidneys each minute
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- Interesting facts about the urinary system
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- Chapter 30 the urinary system workbook answers
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- Urinary system fun fact
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