Building Blocks of the Human Body

The human body can be considered to be a combination of very complex groups of systems that function smoothly. When this organization is examined from the constituent molecules upward toward the systems, the lowest layer is amino acids, nucleotides, saccharides, and lipids. Upon their combination, proteins and enzymes, polynucleotides, polysaccharides, and lipoid structures are formed. These, in return, form the cells, tissues, organs, organ systems, and finally the living organism, the human body.