The heart and lungs are very related, as they work together to keep your body running. They release oxygen into cells, organs and tissues in your body. Your lungs are inside your chest in the left and right side. They can be described as "spongy organs". Lungs help you breath by inhaling air from your surroundings and putting fresh air into your bloodstreams. When you exhale you release used oxygen, or carbon dioxide.
Many people think you have one whole lung, but you have two. Your right lung has an upper, middle, and lower lobe, but your left one has two lobes in order to make room for your heart.
Your heart is placed in the middle of your chest, a little bit to the left as I explained before, and it is about the size of your fist. If you want to learn more aboutt the heart, review "How does the heart work?" on page two.
There are many ways the heart and lungs work together, and here we will be talking about a few. First of all, the heart and lungs main job is to get oxygen to all your tissues, they do that by the heart pumping unoxygenated blood into your lungs, and your lungs oxygenating it. Then the blood gets sent to your tissues and nourishes them with platelets, plasma, white and red blood cells. Blood cells without oxygen are sent back to the lungs to get oxygenated. All of this happens through the pulmonary circuit, which is the portion of the cardiovascular system which carries deoxygenated blood away from the heart, to the lungs, and returns oxygenated blood back to the heart.
Blood without oxygen is specifically deposited into the right atrium of the heart, and as I said in "How does the heart work?" The atrium contracts which sends blood into the right ventricle which also contracts, pushing blood without oxygen to the pulmonary artery inside of the lungs. Many things happen then in the lungs, including the transportation of the blood to artery branches into arterioles, and into capillaries, which then continue on into the alveoi, or the air sacs of the lungs. The alveoli and capillaries are extremely small, only a cell each so the air flows easily. Inside of the pulmonary circuit unused oxygen from the alveoli goes into the red blood cells and "revives" them in the capillaries, but carbon dioxide is put into the alveoli where it is oxygenated and cleaned. It is then pushed back into the heart by the pulmonary veins. The left atrium takes the oxygenated blood and puts it into the left ventricle which pumps it into your blood that circulates the body. This happens all day, but don't worry! Your heart will beat for a very long time