In Anatomy and Physiology courses, students often struggle with visualizing structures, or processes, that occur at the cellular level, such as capillary exchange. Whenever available, models can be vital to students' understanding of a topic, particularly when they can be constructed by students in real time. To demonstrate capillary exchange to freshmen and sophomore Anatomy and Physiology students, a senior Health Sciences student created a simple model. The student enrolled in an independent study as a near-peer laboratory assistant. In addition to assisting the Anatomy and Physiology students learn in the lab, the near-peer student was asked to create a tool for active learning of a difficult physiological concept. Presented here are the materials and steps to create the model, recommended exercises for students to complete with the model, and example assessments that demonstrate how the activity helps students meet the relevant HAPS learning outcomes.