1. Excretory System o

2. Body Functions Remember: Toxins broken down in the liver end up in the blood. The cells receive nutrients form the blood and produce waste that gets picked up by blood = Build up of waste products in the blood stream How Do We Remove these wastes so they don’t build up and kill off your cells?

3. Excretion Excretion: Removal of waste from the bloodstream. Protein Excretion: -Protein is made from amino acids -Excess proteins are converted into carbohydrates. -Converting amino acids to carbohydrates involves removing the amine group (NH2)= deamination

4. Deamination Deamination: removal of amine group. Occurs in the liver Creates Ammonia

5. Urea Problems with ammonia: The ammonia made in the liver is a toxic substance. Your liver is able to combine 2 ammonia with 1 carbon dioxide to produce Urea Urea: A less toxic form of nitrogen waste. 1000x less toxic than ammonia

6. Uric Acid Uric Acid: A waste product from the decomposition of nucleic acid (building blocks of DNA).

7. Water Need for Water: -Average human loses 2L of water a day (8 cups) -Lost through: -Respiration (breath out CO2 and Water) -Sweating -Urination

8. Urinary System (Excretory) Urinary System: A group of organs that Collect store and eliminate Nitrogenous wastes. Parts of the urinary System: Kidney Function: 1)Maintain blood volume and pressure 2)Balances ions (Na, Cl, K, Ca etc.) 3)Filters waste from blood (Urea and Uric Acid)

9. Review video Urinary System-the nephron elcheguevarra