3.1.1.2 The structure and functions of the cardio-respiratory system
What you need to know
Explain the sequence of the cardiac cycle, including diastole (filling) and systole (ejection) of the chambers.
Trace the pathway of deoxygenated blood into the right atrium, then the right ventricle, and through the pulmonary artery to the lungs.
Describe how gas exchange oxygenates the blood in the lungs.
Trace the pathway of oxygenated blood through the pulmonary vein back to the left atrium, into the left ventricle, and its ejection via the aorta to the body.
Understand that valves open due to pressure and close to prevent backflow.
