Body Systems Keep us Alive

• The digestive system helps keep us alive because it helps break down the foods and drinks and get all the molecules of nutrients before they can be absorbed into the blood and carried to cells throughout the body.
• The urinary system helps keep us alive because it helps with the lungs, skin, and intestines-all of which also excrete wastes-to keep the chemicals and water in your body balanced.
• The respiratory system is important because it takes in carbon dioxide and produce oxygen, which keeps us alive. The respiratory system gets oxygen from the air so that cells can change food into energy. We need energy for our bodies and then we can stay active.