What’s the Size of Your Heart?

The human heart is one of the most remarkable organs in the body, responsible for pumping blood throughout the entire body. It’s only the size of a fist, yet it performs an incredible amount of work. With heart disease being one of the leading causes of death worldwide, it’s crucial that we understand the size of our hearts and how to take care of them. In this article, we will explore the size of the human heart, how it works, and what we can do to keep it healthy.

Size of the Human Heart

The average human heart is about the size of a closed fist, weighing between 250 and 350 grams. However, the size of the heart can vary depending on a person’s age, sex, and overall health. Contrary to popular belief, the heart is not located to the left of the body; it rests more in the center, mostly behind the breastbone.

The size of the heart can change in response to various conditions. For example, if a person engages in regular physical exercise, their heart may become slightly larger to accommodate the increased workload. Similarly, if a person experiences cardiac disease, their heart may enlarge due to the extra work it must perform.

Heart Size Based on Age and Sex

The size of the heart can vary depending on a person’s age and sex. On average, men tend to have larger hearts than women due to their larger body size. The size of the heart also changes as we age. For example, a newborn baby’s heart is about the size of their fist, whereas an adult’s heart is about three times that size. It’s important to note that, as we age, our heart muscles can become weaker, which can lead to various cardio ailments.

How Does the Heart Work?

To better understand the size of the human heart, we must first understand how it works. The heart’s job is to pump blood throughout the body to keep all of our internal organs working properly. Blood is transported through a vast network of arteries, veins, and capillaries. Oxygen-rich blood is pumped from the heart to the rest of the body, while oxygen-depleted blood is returned back to the heart to be recirculated.

The heart has four chambers: the left and right atria and the left and right ventricles. The atria receive incoming blood, while the ventricles pump blood out. As each chamber contracts and relaxes, blood is forced through the heart and out into the rest of the body.

The Heart’s Electrical System

The heart has an electrical system that drives it’s pumping action. The electrical signal initiates in the sinoatrial (SA) node, located in the right atrium. Afterward, it travels through the atria and the atrioventricular node (AV node), which is located between the atria and ventricles. The signal then passes through the bundle of His, which divides into smaller pathways that transmit the electrical signal to the rest of the heart. This electrical system ensures that each heartbeat is well-coordinated to effectively pump blood through the entire body.

How to Keep Your Heart Healthy

It’s essential to keep your heart healthy to reduce the risk of heart disease. Here are some steps you can take:

  • Eat a Healthy Diet: A diet rich in fruits, vegetables, whole grains, lean proteins, and healthy fats can reduce your risk of heart disease.
  • Exercise Regularly: Aim for at least 150 minutes of moderate-intensity exercise per week to maintain a healthy heart.
  • Quit Smoking: Smoking increases the risk of heart disease and stroke, among other harmful health effects. Quitting smoking can significantly reduce the risk of these conditions.
  • Manage Stress: High levels of stress can increase your risk of heart disease. It’s essential to learn stress-reducing techniques, such as meditation and yoga, to help manage stress levels.

Heart Disease FAQ

Here are some common questions and their answers related to heart disease:

  • What are the leading causes of heart disease?
    The leading causes of heart disease are high blood pressure, high cholesterol, diabetes, tobacco use, obesity, and a sedentary lifestyle.
  • What are the symptoms of heart disease?
    The symptoms of heart disease may be different for each person. Some common symptoms include chest pain or discomfort, shortness of breath, fatigue, and lightheadedness.
  • Can heart disease be prevented?
    Yes. Adopting a healthy lifestyle, such as eating a nutritious diet, exercising regularly, not smoking, and managing stress can reduce the risk of heart disease.
  • How is heart disease diagnosed?
    Heart disease can be diagnosed through various tests, including electrocardiograms (ECGs), echocardiograms, and cardiac catheterization.
  • What are the treatment options for heart disease?
    The treatment options for heart disease vary depending on the severity of the condition. Some treatments may include lifestyle changes, medications, or surgical procedures like bypass graft surgery.


Barnard, N. D., & Reilly, M. (2019). The Scientific Evidence for a Plant-Based Diet. The Permanente Journal, 23, 18–239. https://doi.org/10.7812/TPP/18-239

Mayo Clinic. (2021, April 22). Heart disease. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/heart-disease/symptoms-causes/syc-20353118

NIH MedlinePlus Magazine. (2011, July). Women, Heart Disease, and Stroke: Facts You Should Know. https://medlineplus.gov/magazine/issues/summer11/articles/summer11pg6-7.html

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