Explain at least two functions of the human digestive, excretory, respiratory, circulatory, nervous, muscular, or skeletal systems.

Create a written and/or visual representation of the location of the major organs of at least two human body systems within the entire body.

Model the structure and/or function of one or more organs from the human digestive, excretory, respiratory, circulatory, nervous, muscular, or skeletal system.

Assess, in collaboration with other students, a model of an organ from a human body system to refine the model.

Critique models in science, such as models of human organs, as representations of natural phenomena, objects, and/or physical processes.

Suggest the processes that scientists might follow to investigate questions related to the structure and/or function of human body systems (e.g., Which factors affect breathing and heartbeat rate? How does the digestion process work? How much air do lungs hold? Why is blood red? Where does my food go?).

Rephrase, into a testable form, questions about the structure and/ or function of one or more body systems.

Design and carry out procedures, including identifying and controlling variables, to investigate the structure and/or function of one or more body systems (e.g., the influence of exercise on heart rate, the role of simulated saliva in starting the digestion process, and factors that influence a person's response time).

Compile and display data from investigations related to the structure and/or function of human body systems using appropriate formats such as frequency tallies, tables, and bar graphs.

Suggest explanations for patterns and discrepancies in data collected during investigations related to the structure and/or function of human body systems.

Imagine how a human body might function or look if it did not have one or more of the major body systems.