What structure is being labelled by the number 7 in the diagram below?

Number 7 depicts the right ventricle. This is the lower right chamber of the heart. This is responsible for getting the deoxygenated blood from the right atrium, and it makes sure that the lungs will get enough oxygen so that it will be sustained.

A lot of people are not aware that the heart is not only responsible for pumping blood, it is also responsible for making sure that all parts of the body get enough oxygen so that they can continue doing what they are supposed to do. If the body does not get enough oxygen, various organs will start to die until the whole body cannot function anymore.