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The heart is like a Timex watch: It takes a beating and keeps on ticking. It’s the human body’s workhorse, always on and playing a vital role in keeping you alive. The way the heart works is easy to grasp—it’s a pump, drawing blood in and sending it out.
But that’s the super-simplified version of how the heart functions. Here are seven amazing facts about the heart that will blow you away.
Sources: Centers for Disease Control and Preventi... + 13
- Centers for Disease Control and Prevention. Life Expectancy. January 9, 2026.
- British Heart Foundation. How a Healthy Heart Works. November 1, 2024.
- American Society of Hematology. Blood Basics. Accessed February 17, 2026.
- National Heart, Lung, and Blood Institute. How the Heart Works: The Heart. March 24, 2022.
- Johns Hopkins Medicine. Anatomy and Function of the Heart’s Electrical System. Accessed February 17, 2026.
- Cleveland Clinic. Blood Vessels. February 12, 2025.
- NASA. How Far Away Is the Moon. July 23, 2021.
- National Heart, Lung, and Blood Institute. How Blood Flows through the Heart. June 25, 2025.
- Cleveland Clinic. Blood Flow Through the Heart. November 8, 2023.
- National Heart, Lung, and Blood Institute. What the Heart Looks Like. March 24, 2022.
- Johns Hopkins Medicine. Dextrocardia. Accessed February 17, 2026.
- Cleveland Clinic. Cardiac Tumor. April 29, 2022.
- Merck Manual Consumer Version. Overview of Heart Tumors. June 2024.
- Rog-Zielinska EA, Norris RA, et al. The Living Scar–Cardiac Fibroblasts and the Injured Heart. Trends Mol Med. 2016 Feb;22(2):99-114.
