Histology is the microscopic study of tissue structure. Cytology is the microscopic study of cell structure. Radiographic anatomy is the study of the structure of the human body utilizing x-rays. The human body is organized in a most meticulous manner, Figure 9 . Atoms combine in appropriate manners to form molecules in the chemical organization of the body.
Molecules combine appropriately to form cells.
When enough organ systems accumulate, an organism is formed. Metabolism occurs in living processes. Ingestion contributes to metabolism in that one must first get the goodies into their body. Digestion contributes to metabolism by allowing us to take larger particles and make them smaller. The removal of wastes from the cells and body for disposal, that is through the process of excretion.