When you make a closed fist, it will roughly be the size of your own heart. In addition, if you close and open your fists around 60 times per minute – the normal resting heart rate for adults - you can catch a glimpse at how hard the heart works to pump blood throughout your body.
The heart is an extremely vital organ. It pumps blood throughout the blood vessels of the cardiovascular system to supply the body with oxygen and nutrients.
Inside the heart are four chambers - the right and left atria and ventricles – that alternately fill and pump out blood.
Deoxygenated blood enters the right atrium through the vena cava, and are pumped into the pulmonary arteries by the right ventricle to be resupplied with oxygen. Newly-oxygenated blood enters the left atrium through the pulmonary veins. The left ventricle then pumps this blood up the aorta to return to the bloodstream.
Furthermore, the heart also possesses several valves – the tricuspid, pulmonary, mitral and aortic valves – to prevent the backflow of blood.
In this heart diagram labelling quiz, you’ll review the different chambers, valves, and passageways that make up the heart and improve your understanding of how they are associated with the lungs and other parts of the body.