1. Chapter 13 Cardiovascular System The Heart

2. The Cardiovascular System This system is how the body moves oxygen, nutrients, and other materials These materials are moved by the blood. The blood moves through tubes.

3. Blood moves in Tubes Arteries  Large tubes that move blood away from the Heart Arterioles  smaller tubes that move blood away from the Heart Capillaries  Very small tubes that exchange materials with the cells Venules  Small tubes that move blood toward the heart Veins  large tubes that move blood toward the heart

4. Which Direction does the Blood move?

5. The Heart The heart is the pump that makes the blood move through our bodies. 1.Blood enters the Right Atrium. 2.Blood enters the Right Ventricle. 3.Blood is pumped to the lungs to get oxygen. 4.Blood goes back to Heart in the Left Atrium 5.Blood enters Left Ventricle. 6.Blood gets pumped to rest of body. 7.Blood goes back to Right Atrium

6. Why does it say ‘Right’ on the left side of the picture?

7. Tubes attached to the Heart From the body the blood goes through one of two tubes to get to the right atrium – Superior Vena Cava (Anterior Vena Cava) – Inferior Vena Cava (Posterior Vena Cava The blood enters the right ventricle and then leaves through the Pulmonary Trunk to go to the lungs. – After the Pulmonary Trunk the tubes get smaller to go to the lungs and branch off into Pulmonary arteries and pulmonary arterioles – The blood comes back to the Heart by the Pulmonary Veins The blood then goes into the Left Atrium, then Left ventricle and then it leaves through the Aorta to go to the rest of the body

8. Superior Vena Cava Inferior Vena Cava Pulmonary Trunk Pulmonary Arteries Pulmonary Veins Aorta

9. Practice Draw a picture to track the blood that moves in your body. Include in your picture – 4 chambers of the heart 2 atrium 2 ventricles – Lungs – Aorta – Capillaries that represent the body

10. Review Blood enters the heart into the Right Atrium Blood moves into the Right Ventricle Blood leaves through the Pulmonary Trunk to go to the lungs Blood comes back to the Heart and enters the Left Atrium Blood then enters the Left Ventricle and the leaves to the rest of the body and goes through the Aorta

11. Parts Inside the Heart Blood only moves in one direction. What stops it from moving in the wrong direction? There are one way valves that prevent blood moving backward. Between the atria and the ventricles are the atrioventricular valves. These valves are supported by strings called chordae tendineae Between the ventricles and the arteries that go away from the Heart are the Semilunar Valves

12. 1.Aorta 2.Semilunar Valve 3.Right Atrium 4.Atrioventricular Valve 5.Right Ventricle 6.Chordae Tendineae 7.Left Ventricle 8.Semilunar Valve 9.Atriuventricular Valve 10.Left Atrium 11.Pulmonary Trunk What is all this stuff?

13. More Parts of the Heart The Septum is the section of the Heart that divides the Right Ventricle and the Left Ventricle The Heart is a muscle and it also needs oxygen and food. It gets this by way of the Coronary Arteries and the Heart gets rid of its waste by the Coronary Veins

14. Anterior Vena Cava Posterior Vena Cava Pulmonary Trunk Aorta

15. Septum