(click on the image for the full picture. It has labels for the heart.)
Right Atrium - receives blood from the upper and lower body. It is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right tricuspid valve. Valves prevent the back flow of blood.
Right ventricle - pumps the blood to the lungs to be reoxygenated.
Left atrium - receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium, but has thicker walls. The valve between the left atrium and the left ventricle, the left bicuspid valve, is smaller than the tricuspid. It opens into the left ventricle.
Left ventricle - pumps the blood throughout the body.
Aorta - the largest artery in the body, which originates from the left ventricle.
Now, let's watch a video about the circulatory system. I am sure that this would be useful! =)
