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Heart Definition


The muscular organ that pumps blood throughout the body is the heart. It is located in the chest, between the lungs, and is roughly the size of a fist. The four chambers that make up the heart are the right atrium, right ventricle, left atrium, and left ventricle. Blood is pumped into the heart's two ventricles from the two atria, then dispersed to the rest of the body.

Function of Hearts

The body's tissues utilize the oxygen the blood from the lungs carries to make energy. Carbon dioxide, a waste, is also carried by it. Blood also contains other vital components for the body's processes, such as nutrients, hormones, and other chemicals. Blood is pumped through the bodysuit by the heart, a muscular organ, and then returned to the lungs for breath. The heart is the body's most important muscle, continuously delivering oxygen and nutrients to all of the body's cells.

Heart Definition

The electrical system that controls the heart's chamber contractions provides electricity to the unit. The sinoatrial (SA) node in the right atrium is a specific set of cells regulating this electrical system. The SA node produces electrical signals that travel through the atria and trigger the atria to contract. The atrioventricular (AV) node, which is situated between the atria and the ventricles, receives the electrical signals. The AV node then sends the electrical signals down specialized pathways called bundle branches, which reach the ventricles and trigger them to contract. As a result, the signals are slowed down, and the flow of electrical impulses to the ventricles is controlled.

The heart muscle must work efficiently and coordinate with the rest of the body's systems. To do this, the heart is regulated by the nervous system and by hormones produced by the endocrine system. Hormones such as adrenaline, noradrenaline, and thyroid hormone also regulate the heart's functions. The sympathetic nervous system raises blood pressure and heart rate to trigger the "fight or flight" response. On the other hand, the parasympathetic nervous system slows the heart rate and lowers blood pressure.

Structure of Heart in Detail

The structure of the human heart is highly organized and consists of several distinct parts that work together to perform the important functions of blood circulation. The following are the heart's main parts:

Heart Definition
  • Atria: The right and left atria are the two atria of the heart. The chambers that collect blood from the veins and pump it into the ventricles are known as the atria.
  • Ventricles: The heart also has two right and left ventricles. The chambers, known as the ventricles, take blood from the atria and pump it across the arteries to the rest of the body.
  • Septum: The tissue wall separating the right and left sides of the heart is known as the septum. It prevents blood from mixing between the two sides and helps to maintain the proper flow of blood.
  • Valves: Four valves in the heart control blood flow and stop backflow. The tricuspid, mitral, aortic, and pulmonary valves are the valves.
  • Coronary Arteries: The coronary arteries provide the blood flow for the heart. These arteries originate from the aorta and branch off to supply the heart muscle with oxygen and nutrients.
  • Pericardium: The sac known as the pericardium surrounds and aids in protecting the heart. A small quantity of fluid that lubricates the heart and lessens friction while it beats is also present.
  • Heart Wall: The epicardium, myocardium, and endocardium are the three layers of tissue that make up the heart wall. The epicardium is the outer layer of thin tissue covering the heart's surface, and the myocardium is the middle layer composed of the heart muscle. The endocardium is the inner layer formed of a thin layer of tissue that lines the inside of the heart.

Each of these components of the heart works together to ensure the proper functioning of the heart and blood circulation throughout the body. Understanding the heart's structure is important for understanding how it works and the various conditions that can affect it.

A Heart-Related Issue

The arteries that feed the heart muscle with oxygen and nutrients branch off the aorta, the main blood channel that transports blood from the heart. The heart also has its blood supply provided by the coronary arteries. The coronary arteries can become narrow or blocked, a condition known as coronary artery disease, which can lead to a heart attack. When the blood supply to a section of the heart muscle is cut off, the affected section dies, resulting in a heart attack.

Heart Definition

Arrhythmias are abnormal heart rhythms that can cause the too slow, heart to beat too fast or irregularly. The heart can also be affected by other conditions, such as heart valve disease, heart rhythm disorders (arrhythmias), and congenital heart disease (heart defects present at birth). When one or more of the heart's valves break and obstruct the regular flow of blood through the heart, heart valve disease results. When the heart or the blood channels close to the heart do not grow correctly before birth, congenital heart disease is a problem that results.

In addition to medical conditions, lifestyle factors such as diet, exercise, and smoking can also affect the heart's health. A diet high in fat and cholesterol and low in fiber and nutrients can increase the risk of heart disease. Sedentary lifestyles and a lack of exercise can also cause heart disease. Smoking increases the risk of heart attack and stroke by harming the heart and blood vessels.

A Few Facts Related to Heart

Heart Definition

The human heart is a vital organ responsible for pumping blood throughout the body, and it plays a crucial role in maintaining health and is often referred to as the "engine" of the human body. Here are some key facts about the human heart:

  • Anatomy: A muscular organ in the chest, the heart is situated above the diaphragm, behind the sternum, and between the lungs. It weighs between 250 and 350 kilograms and has a size similar to a closed fist.
  • Blood flow: The cardiovascular system is a system of blood channels through which the heart pumps blood. Blood travels through arteries from the heart to the rest of the body and returns through veins.
  • Heart Chambers: The right atrium and ventricle, along with the left atrium and ventricle, make up the heart's four chambers. Deoxygenated blood is gathered and pumped by the right atrium and ventricle, and oxygenated blood is gathered and produced by the left atrium and ventricle.
  • Heartbeats: The heart regularly beats, generating a rhythmic pulse that can be felt in different body parts. On average, the heart beats 60-100 times per minute, but this can vary depending on various factors such as exercise, stress, and age.
  • Blood Pressure: The heart's pumping action generates blood pressure, which is the force of blood against the walls of blood vessels. High blood pressure is a common health problem that increases the risk of heart disease, stroke, and kidney disease.
  • Electrical activity: The heart's rhythm is regulated by electrical impulses in a specialized group of cells called the sinoatrial (SA) node, located in the right atrium. The heart muscle contracts and blood is pumped as the electrical impulses pass through it.
  • Heart Valves: Four valves in the heart control blood flow and stop backflow. The valves are the tricuspid valve, mitral valve, aortic valve, and pulmonary valve.
  • Blood Supply: The heart receives its blood supply through the coronary arteries, which originate from the aorta and branch off to supply the heart muscle with oxygen and nutrients.
  • Heart Disease: Heart disease, which encompasses a variety of disorders that affect the heart and blood arteries, is the third greatest cause of mortality in the world. Heart attacks, heart failure, coronary artery disease, and arrhythmias are typical forms of heart disease.
  • Importance: The heart is essential for life, and its proper functioning is necessary for maintaining good health. Regular exercise, a healthy diet, and avoiding risk factors such as smoking, high blood pressure, and high cholesterol can help to keep a healthy heart.

A Few Common Myths About the Heart

Heart Definition

Here are a few common myths about the heart:

  • Myth: Your heart skips a beat when you're scared.
    Fact: This is a common expression, but it's not true. When you experience a sudden startle or fear, you may feel a rapid heartbeat or fluttering sensation, but this is due to a release of adrenaline and a temporary increase in your heart rate, not because your heart has skipped a beat.
  • Myth: The heart is located on the left side of the body.
    Fact: The heart is located in the center of the chest, behind the sternum, and slightly to the left, and it is not located entirely on the left side.
  • Myth: The heart is only the size of a fist.
    Fact: The size of a heart can differ significantly across people, and it can be impacted by factors such as age, gender, and general health. A normal adult heart can range in size from about the size of a fist to the size of a large grapefruit.
  • Myth: The heart is the source of emotions.
    Fact: The heart is often associated with emotions, but this is a cultural interpretation and not a scientifically proven fact. The heart may respond to emotions by changing its rate or rhythm, but it is not the source of emotions. The brain produces emotions, which the nervous system transmits to the body.
  • Myth: You can feel if your heart is healthy.
    Fact: In many cases, you may not be able to tell if your heart is healthy just by how it feels. Some heart problems, such as high blood pressure, may not cause symptoms, while other conditions, like a heart attack, can cause severe symptoms. It's crucial to visit a doctor for routine tests and examinations to keep a close eye on the condition of your heart.


In conclusion, the heart is an important and complicated organ that pumps blood throughout the body and provides oxygen and nutrition to vital organs. It is essential to sustaining good health. The heart comprises several parts, including the atria, ventricles, septum, valves, coronary arteries, and blood vessels.

Maintaining a healthy heart is essential for overall well-being and quality of life. Despite its importance, there are many misconceptions and myths about the heart, and it's important to have accurate information to promote good heart health. The heart may be kept healthy through regular checkups, a healthy lifestyle, and quick medical attention.

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