Body Atlas

Heart and the Body · Heart

Why does my heart race before a presentation?

Who turns the dials: nerves and hormones.

The simple answer

Your heart starts its own beats — but it still takes orders. Your body constantly adjusts how fast and how hard it pumps.

Go deeper

There's more: who turns the dials: nerves and hormones. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy