1. HS130: Anatomy & Physiology II
Unit 6 Seminar:
The Urinary System

2. Tonight’s Agenda Welcome Course Questions, Problems & Issues
Unit 5 Review
Seminar discussion

3. Unit 5 Issues to Review Absorption-Where?
Dietary fats are converted into?
Carbs break down into?
Where does Krebs cycle occur?
Where is electron transport?

4. The Urinary System
The Heart
The Urinary System

5. Chapter 19 The Urinary System

6. Structures
Kidneys
Ureters
Bladder
Urethra

8. Function of Kidneys Excrete toxins and nitrogenous wastes
Regulate levels of many chemicals in blood
Maintain water balance
Help regulate blood pressure

9. Kidneys Under back muscles Behind parietal peritoneum
Just above waistline
Right kidney usually a little lower than left

10. Inside the Kidneys Renal cortex Renal medulla Renal pyramids
Renal pelvis
Major calyces
Minor calyces

12. Nephron Microscopic “Functional Unit” Renal corpuscle Renal tubule
Bowman’s capsule
Glomerulus
Renal tubule
Proximal convoluted tubule
Loop of Henle
Distal convoluted tubule
Collecting tubule

15. Ureters
Narrow long tubes with expanded upper end (renal pelvis) inside kidney
Lined with mucous
Muscular layer in wall
Drains urine from renal pelvis to bladder

16. Urinary Bladder Elastic muscular organ Capable of great expansion
Stores urine before voiding

17. Urethra Narrow tube from urinary bladder to exterior
Opening of urethra to the exterior called urinary meatus

18. Steps in UrineFormation
Filtration
Reabsorption
Secretion

19. Micturition
Passage of urine from body (also called urination or voiding)
Regulatory sphincters
Internal urethral sphincter (involuntary)
External urethral sphincter (voluntary)
Bladder wall permits storage of urine with little increase in pressure

20. Micturition Initiated by stretch reflex in bladder wall
Bladder wall contracts
Internal sphincter relaxes
External sphincter relaxes, and urination

21. Seminar question
The kidneys function as important homeostatic mechanisms for many conditions in the body. Predict what changes in urine production would occur in a patient who suffered a surgical injury to the hypothalamus