Know the structures and functions about your heart new health advisor electricity flow direction

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Knowledge of your heart structure and its function will help you appreciate how this important organ works to pump blood to the whole body. Although it is barely the size of a human fist, the heart is a powerful muscle inside the chest, with a cone shape and a pointed end facing the left. Heart Structure

This is a fibrous covering that wraps around the heart and holds it in place. This special membrane also contains a fluid which lubricates the heart in the pericardial space or cavity to prevent friction. The pericardium has two layers, consisting of a visceral layer directly coving the heart and a parietal layer, which forms a sac containing the fluid in the pericardial cavity. 2. The Heart Wall

Atria are smaller than ventricles and have thin, less muscular walls. They are the receiving chambers of the blood, which is delivered to the heart by the large veins. Ventricles are the larger, more muscular pumping chambers that push blood out to the circulation. They are connected to large arteries that carry blood to the circulation.

The right atrium and the right ventricle are smaller than the corresponding chambers on the left. They have less muscle in their walls compared to the left side of the heart. The difference in size is related to their functions. Blood from the right side of the heart goes to the pulmonary circulation while blood from the left chambers is pumped to the rest of the body. 4. Blood Vessels

• Pulmonary circuit. Deoxygenated blood from the right ventricle enters the pulmonary artery and goes to the lungs where it receives oxygen and releases carbon dioxide. The oxygenated blood then returns through the pulmonary vein to the left atrium.

• Systemic circuit. Oxygenated blood is pumped from the left ventricle to the systemic circulation through the aorta, which branches out into smaller arteries and capillaries to supply the rest of the body with oxygen. From the different organs and tissues, deoxygenated blood returns to the heart through the veins, which drain into the venae cavae, and into right atrium.

Heart structure and function can also be described by the Cardiac Cycle: The heart’s main function is to pump blood to the circulation. This is accomplished by a series of contractions (systole) and relaxation (diastole) of the heart muscle, which occurs in a rhythmic or cyclic pattern.

The right atrium, which has been filled with blood from the circulation, contracts and empties blood into the relaxed right ventricle, with the tricuspid valve open. Almost at the same time, blood from the left atrium, which has come from the lungs, empties into the left ventricle, through the open mitral valve. During this time, the valves in the venae cavae and the pulmonary vein are closed to prevent the backflow of blood.

The cardiac cycle produces a heartbeat, which usually takes less than a second. Your heart rate or number of heart beats per minute depends on your level of activity, so you have a slower rate when you are at rest and a faster rate during exercise. Facts About the Heart

Knowledge of your heart structure and its function will help you appreciate how this important organ works to pump blood to the whole body. Although it is barely the size of a human fist, the heart is a powerful muscle inside the chest, with a cone shape and a pointed end facing the left. Heart Structure

This is a fibrous covering that wraps around the heart and holds it in place. This special membrane also contains a fluid which lubricates the heart in the pericardial space or cavity to prevent friction. The pericardium has two layers, consisting of a visceral layer directly coving the heart and a parietal layer, which forms a sac containing the fluid in the pericardial cavity. 2. The Heart Wall

Atria are smaller than ventricles and have thin, less muscular walls. They are the receiving chambers of the blood, which is delivered to the heart by the large veins. Ventricles are the larger, more muscular pumping chambers that push blood out to the circulation. They are connected to large arteries that carry blood to the circulation.

The right atrium and the right ventricle are smaller than the corresponding chambers on the left. They have less muscle in their walls compared to the left side of the heart. The difference in size is related to their functions. Blood from the right side of the heart goes to the pulmonary circulation while blood from the left chambers is pumped to the rest of the body. 4. Blood Vessels

• Pulmonary circuit. Deoxygenated blood from the right ventricle enters the pulmonary artery and goes to the lungs where it receives oxygen and releases carbon dioxide. The oxygenated blood then returns through the pulmonary vein to the left atrium.

• Systemic circuit. Oxygenated blood is pumped from the left ventricle to the systemic circulation through the aorta, which branches out into smaller arteries and capillaries to supply the rest of the body with oxygen. From the different organs and tissues, deoxygenated blood returns to the heart through the veins, which drain into the venae cavae, and into right atrium.

Heart structure and function can also be described by the Cardiac Cycle: The heart’s main function is to pump blood to the circulation. This is accomplished by a series of contractions (systole) and relaxation (diastole) of the heart muscle, which occurs in a rhythmic or cyclic pattern.

The right atrium, which has been filled with blood from the circulation, contracts and empties blood into the relaxed right ventricle, with the tricuspid valve open. Almost at the same time, blood from the left atrium, which has come from the lungs, empties into the left ventricle, through the open mitral valve. During this time, the valves in the venae cavae and the pulmonary vein are closed to prevent the backflow of blood.

The cardiac cycle produces a heartbeat, which usually takes less than a second. Your heart rate or number of heart beats per minute depends on your level of activity, so you have a slower rate when you are at rest and a faster rate during exercise. Facts About the Heart