https://www.khanacademy.org/science/telangana-class-10-biologyin/x58e314ef7f27e124:transportation-and-circulation/x58e314ef7f27e124:heart-beat/e/heart-beat 2026-01-11T08:44:04.593456302Z Heartbeat This section explains what a heartbeat and pulse represent and how they can be felt or measured. It links heart muscle contractions to pulse detection and sound transmission using simple tools. Through everyday scenarios, it shows how activity, emotions, age, and fitness influence heart rate and circulation needs. Khan Academy exercise