Featured in PASCO’s College Biology Instructor Guide

College Biology Instructor Guide


College Instructor edition with 26 experiments covering introductory and general biology topics.

Endotherms & Ectotherms

Lab Summary

Use a carbon dioxide gas sensor to explore how an endotherm and an ectotherm regulate internal temperatures by measuring the respiration rates of two different organisms exposed to varying temperatures.


Students explore the different ways that endotherms and ectotherms respond to temperature change by:

  • Examining the relationship between the external temperature and an organism's respiration rate.
  • Observing an organism's behavior as it responds to a temperature change.


Students gain experience conducting the following procedures:

  • Measuring the respiration rate of two different organisms.
  • Correlating their observations of an organism's behavior to the organism's respiration rate.

Sensors / Equipment Used:

PASPORT Carbon Dioxide Gas Sensor


The PASPORT Carbon Dioxide Gas Sensor measures carbon dioxide concentration CO2 (parts per million) in gases such as air. Ideal for studies of photosynthesis, respiration, fermentation and more.

PASPORT Quad Temperature Sensor


Allows any combination of our stainless steel, fast response or skin/surface temperature probes for a wide variety of temperature measurement. For use with PASPORT Interfaces.

PASPORT Sensor Extension Cable


Allows an additional two meter length extension on all PASPORT sensors.

Materials Used:

Beaker, 2 L (or similarly sized container) 
Beaker, 350-mL or smaller 
Crickets - 10
Electronic Balance - 1 per class
Ice and water - 1 liter
Large Base and Support Rod 
Lint-free tissue 
Mouse, 5 to 10-g 
Sampling bottle (with sensor) 
Three-Finger Clamp 

The Associated Bundle:

College Biology Bundle


A complete probeware bundle designed for PASCO's College Biology curriculum

Interface Required

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