Illness and Injury: Science Videos

This short series covers two common health issues. Most of it explains high blood pressure, what the numbers mean, and how it harms the heart and blood vessels. It also explains how flu strains get their names and why we sneeze, cough, and hiccup. High blood pressure is very common and often has no symptoms, so understanding it can protect your health.

Note: All Khan Academy content is available for free at www.khanacademy.org