Digestive system
What is the main organ of the digestive system?
Mouth and esophagus
What do all living organisms need?
Oxygen
What organ pumps blood
Heart
What organ cleans blood?
liver
What organ controls the commands of the body?
Brain
What gas is released in gas exchange?
Carbon dioxide
How many chambers are in the heart?
4
What veins carry only oxygenated blood?
Pulomary veins
What substance protects the stomach from Gastric juice?
Mucus