Arctic Tundra

This video segment from Wild Europe: "Wild Arctic" explores the struggle for survival in one of Earth's most extreme environments.

Accessibility features: Audio Description, Caption, Transcript

Blood Flow and Thermoregulation

In this interactive activity adapted from the University of Alberta, learn about the ways your body can regulate its temperature.

Body Breakdowns

This interactive feature from the NOVA "Surviving Denali" Web site details the variety of ways the body can fail while climbing a high-altitude peak.

Body Control Center

Throughout the day, your nervous system monitors and makes endless adjustments to your body's basic systems -- all to keep you alive. This interactive feature illustrates the complexity of such a task.

Everest: Test Your Brain

This interactive feature from the NOVA "Everest" Web site lets you take the same brain quizzes that researchers used to test the brain function of climbers on Mount Everest.

Fever!

This video describes the role of the brain in regulating body temperature and how sometimes fever is employed to fight off infection.

Accessibility features: Audio Description, Caption

Fighting Back

Help the immune system fight off an infection in this interactive feature from the NOVA: "Surviving AIDS" Web site.

Function of Fever

Fevers are a sign of infection, but they may also be part of the cure. This drawing illustrates Matthew Kluger's lizard study, which supports the notion that fever can be beneficial.

Accessibility features: Long Description

Human Body Regulation

Students learn how the human body self-regulates to maintain a stable internal environment despite changes in the external environment.