In this part of the activity, students will begin to consider how complex the human body is and how its complexity is often taken for granted. Things just seem to function day after day, year after year, until something disrupts one or more of the systems – just as in a city the subway moves or traffic flows, until it doesn't.
Connect the mapping introduction to the human body interactive. Ask students to discuss:
Have the students open the Interactive Human Body activity. Paraphrase:
Scientists classify the systems of the human body in various ways. Eleven organ systems of the human body are pictured on your screens. You can blend different systems together. Add each system by moving its slider to the right. Read about what makes each system unique, and take notes.
If your students need more guidance in how to get started, have them select either a female or male integumentary system. Next add the muscular system. What happens when you add another system? What happens when you remove a system? Have students play with the available options before reading about function and parts.
The interactive activity was designed for students working as individuals, pairs, or triads to explore on an electronic device. However, you may not be able to use electronic devices in your classroom, so a printable version is included below. Of course, it does not have the same variable opacity of the interactive activity.
You might consider printing the layers on clear printer paper, sold as "computer-printable transparent plastic sheets" or "transparency film." If using this method, consider backing the explanatory text with opaque paper to aid legibility.
Alternatively, if you have an overhead projector or light table at your school, you can use that for students to lay the different systems on top of one another and see how systems co-locate. Finally, a last option is to let students lay the sheets on a large window on a non-gloomy day. Using standard paper, up to 5 sheets of paper might be somewhat translucent when backlit, but you'll get the best results when you overlay just 2 or 3 sheets at a time.
Some teachers opt to have the physical layers available to all groups regardless of whether the students also use electronic devices. If you make these tangible layers part of the activity, extend the time by five minutes. And have an overhead projector or light table on hand.