1. The heart

2. The Heart Describe the role of the heart in the circulatory system. Explain the differences between arteries, veins and capillaries, by relating their structure to their function. Explain the role of coronary arteries. Describe what is coronary heart disease. Title: Learning outcomes:

3. Keywords for the heart Atrium (ae-tree-um) – the first chamber into which blood enters. Ventricle (ven-trik-al)– the lower chambers of the heart. Blood is pumped from these. Arteries – Blood vessels that take blood away from the heart. Veins – Blood vessels that bring blood back to the heart. Capillaries – the smallest blood vessels. Where Oxygen and nutrients leave the blood and Coronary arteries – arteries that wrap around the heart

5. Right Atrium Vena cava Right Ventricle Left Atrium Left Ventricle Pulmonary artery Aorta Right sideLeft side

7. 1.Which side of the heart contains oxygenated blood? The left side of the heart 2.Which parts of the heart receive blood from the lungs? Left atrium and left ventricle 3.Which part of the heart receives blood from the rest of the body? Right atrium 4.Which parts of the heart pump blood into the ventricles? Atria 5.Why do the ventricles have thicker walls than the atria? Because they have to pump blood to the lungs and to the rest of the body 6.Why does the left ventricle have thicker walls than the right ventricle? Because the left ventricle has to pump blood at high pressure around the rest of the body

8. Double circulatory system A double circulatory system separates the oxygenated and the deoxygenated blood. The pulmonary circuit pumps blood to the lungs. The systemic circuit pumps blood to the body systems (i.e. The head, limbs, and trunk).

9. Double circulatory system The right ventricle pumps blood through the shorter pulmonary circuit. The left ventricle pumps blood through the longer systemic circuit. As a result, the left ventricle’s walls are thicker and stronger.

12. The flow of blood around the body Arteries take blood away from the heart. Veins take blood to the heart.

13. Questions about the circulatory system What is a double circulatory system? Blood passes through the heart twice on each full circulation of the body. What is oxygenated blood? Oxygenated blood is blood where the red blood cells are carrying oxygen. Where do red blood cells pick up oxygen? The capillaries that run though the lungs

14. Blood vessels

15. Why do they have different structures?

16. Coronary Arteries The heart is made of muscle cells. Just like other cells in the body, these heart cells need a supply of oxygen and nutrients. Coronary arteries deliver blood containing oxygen and nutrients to the heart.

17. Why does coronary heart disease happen? Coronary heart disease is what happens when your heart's blood supply is blocked or interrupted by a build-up of fatty substances in the coronary arteries. Over time, the walls of your arteries can become furred up with fatty deposits. Coronary heart disease can be caused by lifestyle habits and other conditions, such as:

18. Describe how blood circulates around the body. Heart pumps Cardiac muscle contracts Ventricles fill Blood forced out under pressure LHS of heart stronger Oxygenated blood pumped to organs of the body from LHS RHS pumps deoxygenated blood to the lungs Blood under pressure from the heart passes through arteries Blood returning to the heart flows through veins Blood moves from arteries to veins through capillaries.