Problem: Review some key concepts from this chapter by highlighting the correct word or words in each of the following sentences. Need Assignment Help? 1. The study of the structure of the body is called (physiology)(anatomy). 2. The smallest living units that make up the body's structure are called (organelles)(cells). 3. Structures of two or more tissue types that work together are called (organs)(organ systems). 4. Anatomical position is when the body is standing erect, arms at the sides, with palms facing (backward)(forward). 5. A disruption in one organ system usually has (no effect on) (consequences in) other systems.