Featured in PASCO’s Advanced Biology through Inquiry Teacher Guide
This manual features 22 challenging, standards-based, inquiry lab activities for AP, IB, and honors programs.
Students use a colorimeter to determine which extracellular fluid is hypertonic to a model cell and which solution is hypotonic.
Students build models that help them understand how blood osmolarity and kidney function maintain homeostasis. Students determine which extracellular fluid is hypertonic to a model cell and which solution is hypotonic.
Diffusion within biological systems is affected by several factors. The most notable is the concentration gradient across a membrane. A large concentration gradient across the membrane speeds up diffusion. Other factors affecting diffusion rates within biological systems include temperature, distance between solute and membrane, surface area-to-volume ratios, and solute size. All these factors can be manipulated in student-centered investigations.
This experiment may require software and an interface for data collection.