Truly modern molecular biology emerged with the uncovering of the structure of DNA in the 1960s and concurrent advances in biochemistry and genetics. Molecular biology is one of three primary molecular-scale biological sciences, the others being biochemistry and genetics.
1 Students should know the parts and functions of the circulatory and respiratory systems and how they work together for respiration. 2  Students should also understand what homeostasis is and that all living things must be able to maintain homeostasis.
In our discussion about how the lungs work, we said that you need oxygen as fuel for everything you do. To help you better understand how the heart and lungs interact with each other, let's follow the journey of an oxygen molecule in the air you inhale. Starting from your mouth or nose, the oxygen molecule moves through smaller and smaller airways until it reaches tiny air sacs known as alveoli.