Your heart is located in between your lung in the middle of her chest, behind and slightly come the left of her breastbone (sternum). A double-layered membrane dubbed the pericardium surrounds your heart favor a sac. The outer layer that the pericardium surrounds the roots of her heart"s major blood vessels and is fastened by ligaments to your spinal column, diaphragm, and also other components of your body


The love weighs between 7 and also 15 ounces (200 to 425 grams) and is a small larger 보다 the size of her fist. By the finish of a long life, a person’s heart may have actually beat (expanded and contracted) more than 3.5 billion times. In fact, every day, the median heart win 100,000 times, pumping around 2,000 gallons (7,571 liters) of blood.

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Your heart is located between your lungs in the middle of her chest, behind and also slightly come the left of your breastbone (sternum). A double-layered membrane called the pericardium surrounds your heart like a sac. The outer layer that the pericardium surrounding the roots of your heart’s major blood vessels and is attached by ligaments to her spinal column, diaphragm, and also other components of your body. The inner great of the pericardium is attached come the love muscle. A coating of fluid separates the 2 layers of membrane, letting the heart relocate as it beats.

Your heart has 4 chambers. The upper chambers are dubbed the left and also right atria, and the reduced chambers are called the left and also right ventricles. A wall surface of muscle called the septum the end the left and right atria and also the left and right ventricles. The left ventricle is the largest and strongest chamber in your heart. The left ventricle’s room walls are only about a half-inch thick, yet they have enough force to push blood through the aortic valve and into her body.

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The love Valves

Four valves control blood circulation through your heart:

The tricuspid valve regulates blood flow between the right atrium and right ventricle.The pulmonary valve controls blood flow from the best ventricle into the pulmonary arteries, which lug blood to her lungs to pick up oxygen.The mitral valve lets oxygen-rich blood from your lungs happen from the left atrium right into the left ventricle.The aortic valve opens the method for oxygen-rich blood to pass from the left ventricle right into the aorta, your body’s biggest artery.The Conduction System

Electrical impulses from your heart muscle (the myocardium) cause your love to contract. This electric signal begins in the sinoatrial (SA) node, situated at the peak of the ideal atrium. The SA node is sometimes dubbed the heart’s “natural pacemaker.” An electric impulse indigenous this herbal pacemaker travels v the muscle yarn of the atria and also ventricles, causing them come contract. Return the SA node sends electric impulses at a specific rate, her heart rate might still readjust depending on physical demands, stress, or hormonal factors.

The Circulatory System

The heart and also circulatory system consist of your cardiovascular system. Her heart functions as a pump that pushes blood to the organs, tissues, and also cells of your body. Blood it is provided oxygen and also nutrients to every cell and removes the carbon dioxide and waste commodities made by those cells. Blood is lugged from your heart come the rest of your body v a facility network of arteries, arterioles, and also capillaries. Blood is returned to your heart with venules and veins. If every the vessels of this network in your body were laid end-to-end, castle would prolong for about 60,000 mile (more 보다 96,500 kilometers), i m sorry is far sufficient to circle the earth an ext than twice!