Topics Covered: The hierarchical organization of the body, how cells build tissues, tissues build organs, organs build body systems, and body systems work together in an organism to maintain homeostasis. The 4 main types of tissues (epithelial, muscle, connective, and nervous) and their roles in example organs.

NGSS Standard: HS-LS1-2. Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms. [Clarification Statement: Emphasis is on functions at the organism system level such as nutrient uptake, water delivery, and organism movement in response to neural stimuli. An example of an interacting system could be an artery depending on the proper function of elastic tissue and smooth muscle to regulate and deliver the proper amount of blood within the circulatory system.]