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.
Oxygen Therapy. The lungs work by bringing in the âgood airâ and getting rid of the âbad air.â You breathe in oxygen (O2) and it is passed into your blood through the tiny air sacs (alveoli) in the lungs. From there it goes to every part of your body. When your tissues and muscles use oxygen, carbon dioxide (CO2) is made.