Solution

Alveoli in the Lungs: 1-Thin walled, sac like structure, surrounded with network of capillaries. surrounded with network of surrounded with network of capillaries.surrounded with network of capillaries.surrounded with network of capillaries.capillaries 2-Helps in exchange of gases between blood and outside air. 3- Waste produced is CO, and water. Nephrons in the Kidneys: 1- Thin walled, tubular structure, surrounded by capillaries. 2-Helps infiltration of wastes like urea and uric acid from blood. 3- Waste produced is urine- salts, urea, uric acid etc. dissolved in water (liquid waste).