1. 6.2.1 Draw and label a diagram of the heart showing the four chambers, associated blood vessels, valves and the route of the blood through the heart
Some terms and functions ventricles – pump blood through the body or to the lungs atria – pump blood to the ventricles valves – prevent blood from going the wrong direction (backflow) arteries – carry blood away from the heart (the aorta is the main artery) veins – carry blood to the heart (the superior and inferior vena cava are the main veins)

2. 6.2.2 State that the coronary arteries supply the heart muscle with oxygen and nutrients
The heart muscle is very active and needs a lot of oxygen, glucose and other nutrients
It would be impossible for the heart to obtain these nutrients from the fast flowing blood that travels through the chambers
The walls of the heart are covered with a network of coronary arteries and capillaries

3. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
Right Side The right atrium collects blood from the body from the vena cava The muscle of the right atrium contracts which pushes the blood past the tricuspid valve into the right ventricle The right atrium muscle relaxes

4. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
Right Side The right ventricle muscle contracts increasing the blood pressure in that chamber This causes the tricuspid valve to close and semilunar valve opens

5. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
Right Side Blood flows into the pulmonary arteries and the pressure causes the semilunar valve to close Blood travels to the lungs and then back to the left atrium

6. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
Left Side
The left atrium collects blood from the lungs from the pulmonary vein
The muscle of the left atrium contracts which pushes the blood past the mitral (bicuspid) valve into the left ventricle
The left atrium muscle relaxes

7. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
Left Side
The left ventricle muscle contracts increasing the blood pressure in that chamber
This causes the mitral valve to close
The semilunar valve to opens

8. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
Left Side
Blood flows into the aorta and the pressure causes the semilunar valve to close
Blood travels through the body and returns to the right atrium
The process is repeated

9. 6.2.3 Explain the action of the heart in terms of collecting blood, pumping blood, and opening and closing of valves
This type of circulatory system is called double circulation because the blood goes from the heart to the lungs back to the heart and then to the body.
All mammals have this type of transport system
Important to remember:
The walls of the left ventricle are thicker than the right ventricle.
This is because the left ventricle must pump the blood through the entire body and the right ventricle needs only to pump the blood to the lungs