the urinary system chapter 20 – page 774. function maintain homeostasis through composition, ph,...
TRANSCRIPT
THE URINARY SYSTEM
Chapter 20 – Page 774
Function
Maintain homeostasis through composition, pH, and volume
Excretes foreign substances.
Structures of the System
Kidney’s – create urine by filtering the blood
Structures of the System
Ureters – carry urine from kidney to urinary bladder
Structures of the System
Urinary bladder – stores urine
Structures of the System
Urethra – tube emptying the urinary bladder
Catheter
Kidney Stones
Prevention
Drink enough water to form 2 quarts of urine in every 24-hour period.
Incontinence
The loss of bladder control
Temporary urinary incontinence Alcohol Caffeine Over-hydration Dehydration Medication
Permanent Incontinence
After childbirth Changes with
aging Hysterectomy Enlarged prostate Prostate cancer Neurological
disorders obstructions
The Nephron
Structures of the Nephron
• Glomerulus: mechanically filters blood
• Bowman's Capsule: mechanically filters blood
• Proximal Convoluted Tubule: Reabsorbs 75% of the water, salts, glucose, and amino acids
• Loop of Henle: Countercurrent exchange, which maintains the concentration gradient
• Distal Convoluted Tubule: Tubular secretion of H ions, potassium, and certain drugs.
Kidney Functions (All occur in NEPHRONS 1,250,000 / kidney)
Filtration - High pressure at the glomerulus filters:___ out of the blood into the filtrate
a. Waterb. Glucosec. Saltsd. Amino Acidse. Urea
Kidney Functions (All occur in NEPHRONS 1,250,000 / kidney)
Reabsorption (From filtrate) – Loop of Henle
99% water (178 liters/day) 100% glucose (180 g/day) 91% salts (1 300 g/day) 100% amino acids 50% urea
Kidney Functions (All occur in NEPHRONS 1,250,000 / kidney)
Secretion (From blood stream to the distal tubule)
- Uric acid - Creatine - H+
- Ammonia
Kidney Functions (All occur in NEPHRONS 1,250,000 / kidney)
Excretion (Collecting ducts carry urine toward ureters) a. Water b. Salts c. Uric acid d. Urea e. Ammonia f. Creatine
Urine Composition
