Lab 11. Urinary System.doc

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Lab 11 Urinary System
GENERAL URINARY SYSTEM REVIEW (includes some notes from class)
Urinary system
- Consists of kidneys, ureters, urinary bladder, and urethra.
- Functions:
o Regulation of total body water
o Maintenance of ionic balance
o Excretion of soluble metabolic wastes
o Secretion of hormones (Renin and Erythropoietin)
Nephron
- Functional unit of the kidney
- Located in cortex and medulla
- Function:
o filter the blood
o allow for the excretion of wastes
o recycling of useful substances
Broken down into:
1. Renal corpuscle (filters blood through a network of extensive fenestrated capillaries)
2. Proximal Convoluted Tubule (PCT)
o stems from the urinary pole of the renal corpuscle
o leads into the Loop of Henle
3. Loop of Henle
o thick straight descending limb (SD)
o thin ascending limb (TL)
o thick straight ascending limb (SA)
4. Distal Convoluted Tubule (DCT)
o marks the end of the nephron
The collecting tubules and collecting ducts of Bellini form from the DCT
- They are not part of the nephron!
- Area cribrosa: opening of the collecting ducts into the minor calices of the kidney
Urinary Bladder
- Transitional epithelium
o characterized by facet/dome cells (bulgy, polygonal shaped surface cells)
o able to expand, depending on the amount of urine
LAB REVIEW summarized in table
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