The Urinary Excretory System The Urinary System Paired

The Urinary /Excretory System

The Urinary System § Paired kidneys § A ureter for each kidney § Urinary bladder § Urethra 2

Main Functions of Urinary System § Kidneys filter blood to keep it pure § § Toxins Metabolic wastes Excess water Excess ions § Dispose of nitrogenous wastes from blood § Urea § Uric acid § Creatinine § Regulate the balance of water and electrolytes, acids and bases 3

§ Adrenal glands* lie superior to each kidney (the yellow blob in pic) * * 4

§ Kidney has two regions § Cortex: outer ” § Medulla: inner 5

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The Arteries Aorta gives off right and left renal arteries Renal arteries divides into 5 segmental arteries as enters hilus of kidney 7

Nephron: Functional unit of the kidney. (A tiny filter) – Kidney has thousands of them. 8

Understand at least this much: Filtration a. Fluid is squeezed out of the glomerular capillary bed Resorption b. Most nutrients, water ad essential ions are returned to the blood of the peritubular capillaries Secretion c. Moves additional undesirable molecules into tubule from blood of peritubular capillaries 9

For studying Parts of the kidney: 1. Renal pyramid 2. Efferent vessel 3. Renal artery 4. Renal vein 5. Renal hilum 6. Renal pelvis 7. Ureter 8. Minor calyx 9. Renal capsule 10. Inferior renal capsule 11. Superior renal capsule 12. Afferent vessel 13. Nephron 14. Minor calyx 15. Major calyx 16. Renal papilla 17. Renal column 10

§ the urinary system - You. Tube 11