Featured in PASCO’s Advanced Biology through Inquiry Teacher Guide

Advanced Biology through Inquiry Teacher Guide

(PS-2852)

This manual features 22 challenging, standards-based, inquiry lab activities for AP, IB, and honors programs.

Osmosis

Lab Summary

Students use a colorimeter to determine which extracellular fluid is hypertonic to a model cell and which solution is hypotonic.

Theory

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.

Method

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.

Sensors / Equipment Used:

PASPORT Colorimeter Sensor

(PS-2121)

Our PASPORT Colorimeter records all 4 wavelengths simultaneously--no need to guess at wavelength to get a quality measurement.

The Associated Bundle:

Advanced Biology Standard Sensor Bundle

(PS-2851)

Contains an EcoChamber, a Metabolism Chamber and all the probeware needed to perform the activities in the Advanced Biology through Inquiry lab manual.

Interface Required

This experiment may require software and an interface for data collection.