Urinary System
Major  disorders
Structure and functions of Urinary system:
1)
Pair of kidneys: function in removing substances from blood to from urine.

2)
Pair of Ureters: function in transporting urine from kidneys to urinary bladder.

3)
Urinary bladder: functions as urine resevoir that takes in urine from ureters.

4)
Urethra: takes urine from bladder to outside of body.

5)
Renal arteries and veins: carry blood to be filtered to kidneys and carries filtered blood away from kidneys.
Kidneys

- Functions: to regulate the volume, composition and PH of body fluid.
- Consists of three layer portions: Renal cortex (outer), medulla, and Renal pelvis (connected to ureter)
- Covered by Renal capsule
- Consists of approximately 1 million nephrons (functional units vertebrate kidney)
Kidney nephron
- Nephrons are selective filter elements that regulate the coposition of the blood and excrete wastes from blood.

-
Glomerulus is a capillary network which fits into Bowman's capsule.

- Urine and wastes are transported to the collecting duct to the ureter.
Control of Kidney functions

ADH (Anti-diuretic hormone): target the kidney; produced in hypothalamus, and stored and released from Pitutuary gland.
- Stimulates distal tubules and collecting duct to reabsorb more water.
Factors that inhibit ADH releases
- High fluid intake, high blood volume
- low blood sodium level
- Alcohol consumption

Consequences: Water reabsorption decreases,and urine output increases because kidneys are unable to reabsorb or conserve water.
Factors causing ADH release
- low fluid intake, blood volum
- High blood sodium levels
- Nicotine
- Morphine

Consequences: water reabsorption increases, and Urine output decreases. Resulting diarrhea, and excessive sweating.
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