1. Circulatory System

2. What is the circulatory system? The circulatory system is made up of your heart, blood, and blood vessels. It delivers things you need and then picks up and takes away things you don't need.

3. How does it work? Your heart pumps blood through blood vessels to all the parts of your body. Your blood has oxygen in it. When blood travels through your body, it delivers oxygen and nutrients to your body parts. On its way back to the heart, your blood picks up waste so that your body can get rid of the things it doesn't need.

4. How does oxygen get into your blood? When you breathe, the air goes into your lungs. Your heart pumps blood into your lungs and the blood mixes with the oxygen you just breathed. After your blood picks up oxygen, it goes back into your heart. Then your heart sends it through your arteries so that oxygen is delivered to all the cells in your entire body.

5. What are the parts of the circulatory system? The arteries deliver the oxygen-rich blood to the capillaries where the actual exchange of oxygen and carbon dioxide occurs. The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart.capillariesveins So, arteries carry blood away from the heart and veins carry blood back to the heart.

6. The Heart…homework! The heart is made up of ____________. There are ________ chambers within the heart. High blood pressure is known as ____. Hardening of the arteries is known as _________. Cardiac muscle four hypertension Arteriosclerosis