Preparation for teaching:

This text fits nicely with the model of water regulation (R12), exploring the use of an experimental drug for hyponatremia.

Doing the task ahead of teaching will be helpful here, especially looking at both texts R12 and R13 side-by-side, looking for opportunities to students to apply what they know and evaluate how vaptans might restore balance in hyponatremic patients.

Formative assessment

It can be valuable to monitor your students progress as they evaluate how the vaptans work to treat hyponatremia. Listen to how they talk with their partners about their thinking processes, listen for active engagement and how they work through challenges together. Make the confusions and meaning making public and have students share about their thinking processes and what they figured out.