pathway of blood

Question 1

describe the first stage of blood through the heart

Answer 1

• the right atrium receives deoxygenated blood from the vena cava

Question 2

describe the 2nd stage of the blood through the heart

Answer 2

• the deoxygenated blood moves through the right ventricle, which pumps it to the lungs via the pulmonary artery

Question 3

describe the 3rd stage of the blood through the heart

Answer 3

the left atrium receives oxygenated blood from the lungs through the pulmonary vein

Question 4

describe the 4th stage of the blood through the heart

Answer 4

• the oxygenated blood then moves through the left ventricle, which pumps it round the whole body via the aorta

Question 5

describe the 5th stage of the blood through the heart

Answer 5

• the left ventricle has a much thicker wall than the right ventricle, it needs more muscle because it needs to pump blood round the whole body, whereas the right ventricle only has to pump it to the lungs , this means blood in the left ventricle ahs a higher pressure than the right ventricle
• the valves prevent he backflow of blood in the arteries