- All physiological functions are performed by anatomical structures. These functions follow the same physical and mechanical principles that can be seen in the world at large.
- The body can be divided into 11 organ systems, but all work together and the boundaries between them aren’t absolute.
- Physiological systems work together to maintain a stable internal environment, the foundations of homeostasis. In doing so they monitor and adjust the volume and composition of body fluids, and keep body temperature within normal limits. If they cannot do so, internal conditions become increasingly abnormal and survival becomes uncertain.
- Anatomical descriptions refer to an individual in the anatomical position: standing, with the hands at the sides, palms facing forward, and feet together.
