Describe how blood is pumped around the body
Deoxygenated blood enters the heart via the vena cava and moves into the right atrium.
It passes through the tricuspid valve into the right ventricle and then is pushed past the semi-lunar valves into the pulmonary artery where the blood is taken to the lungs to gain oxygen.
When the blood gains oxygen it comes back to the heart via the pulmonary artery and is in the left ventricle. The blood flows past the bicuspid valves into the right ventricle and is then pushed up past semi-lunar valves where the oxygenated blood goes into the aorta and is pumped around the body.