A student measures their resting heart rate and then records their heart rate again after 5 minutes of running.

After eating lunch, students measure a volunteer’s blood glucose and insulin levels at different times.

Students investigate how the human body maintains a stable internal temperature in a warm environment.

When investigating how shivering helps maintain body temperature, which variables should be controlled to ensure a fair test? Select ALL that apply.

Students investigate how stomata respond to changes in humidity and temperature.

Students measure a person’s blood pressure lying down, immediately after standing, and after standing for several minutes.