1. Excretory System

2. Excretory System Function: eliminate nonsolid wastes
Skin: releases excess salts and water
Lungs: removes excess CO2 and water
Kidneys: filters the blood to eliminate waste

3. The Kidneys Basic Functions: Remove waste from the blood
Maintain fluid balance
Release hormones for bones, producing RBCs, and control blood pressure

4. Inside the Kidneys Waste-blood enters the kidney
1) Filtration: water, amino acids, salts, glucose, electrolytes pushed out of the capillaries…into the kidneys

5. Inside the Kidneys 2) Reabsorption of materials
Most filtered materials reabsorbed into capillaries
Prevents loss of nutrients

6. Inside the Kidneys 3) Excretion of materials
Waste materials excreted in urine
Waste flows through the ureter into the bladder
Exits through the urethra

8. Kidney Failure Transplant Dialysis
Main cause: High blood pressure & diabetes
Excess sugar prevents proper filtering
Transplants from siblings most successful
Similar tissue types
Anti-rejection meds taken for life
Dialysis
Machine to filter blood
Waste diffuses into the machine
Clean blood returns to patient
3-4 days/week

9. Blood with waste
Blood without waste