1. Digestive, Respiratory, Circulatory, and Excretory Systems
Human Systems
Digestive, Respiratory, Circulatory, and Excretory Systems

2. Digestive System
Delivers nutrients (glucose) to the circulatory system

3. Respiratory System
Oxygen molecules move from the air to the alveoli of the lungs and then to the circulatory system O₂ O₂

4. Circulatory System
From the circulatory system, glucose and oxygen molecules move from the capillaries into the cells of the body where cellular respiration occurs

5. Cellular respiration oxidized O₂ + C6H12O6 CO₂ + H₂O + ATP
(glucose) (energy)

6. Removal of CO₂
The gas exchange process is reversed for the removal of CO₂
CO₂
CO₂

7. Homeostasis - Blood Sugar
The concentration of sugar in the blood is monitored
Sugar can be stored or pulled from reserves (glycogen) in the liver and muscles to maintain a constant blood sugar level

8. Amino Acids
Amino Acids contained in proteins can also serve as an energy source, but first they must be deaminated, or chemically converted in the liver
This produces a toxic ammonia product, which is converted to water-soluble urea and excreted by the kidneys

10. What is the main purpose of the Respiratory System?
What is the main purpose of the Digestion System?
Write the formula for Cellular respiration?
What is a main purpose of the Circulatory system?