What are lungs and their importance?

One of the organs in the human body is the lungs, and like every part of the body, they have a significant job that only they can do. They are part of the respiratory system and are responsible for inhaling oxygen (O2) and exhaling carbon dioxide (CO2). 
We have two pink, spongy lungs and they are located in the chest area where it is kept safe inside the ribcage which consists of 12 sets of ribs. The lungs also sit on top of a large dome-shaped muscle called the diaphragm. The diaphragm and the ribs both help out with breathing. When inhaling air, the diaphragm moves down (contracts) and flattens out while the ribs are moved up and outwards by the rib muscles, this is so that the lungs have more space to grow larger as more air is pulled into them. When exhaling, they both relax - the diaphragm moves up and the ribs moves in - pushing the air up and out of the lungs. Our lungs expand and shrink when we breathe which is shown by the chest. As we breathe in, our chest gets slightly larger, and as we breathe out, our chest gets slightly smaller. 
The heart, another vital organ, is conveniently situated between the lungs. This means that the blood covering our lungs can exchange gases and travel quickly to the heart which will immediately pump the blood with oxygen to every cell in the body. The lungs are important to make these exchanges of gases. Our bodies need oxygen to survive because it provides energy and growth for the cells in our bodies. Carbon dioxide- a product our bodies make when going through the process called cellular respiration - is a gaseous waste that must be exhaled out of our system.
DID you know? The right lung is actually larger, broader and shorter and divided into 3 lobes: superior, middle and inferior. However, the left lung is smaller and narrower because it needs to make room for the heart which leans to the left and is divided into 2 lobes: superior and inferior.

DID you know? The top parts of both lungs are called the apex and the bottoms of the lungs are called the base. There are two slick layers that cover the lungs called plural membranes. A serous fluid separates them which allow them to slide around easily while you inhale and exhale. It prevents friction and keeps the membranes together.