They produce energy, communicate with other cells, and compose the physical bulk of the body. There are three phases to the cardiac cycle, those are: During the atrial systole phase of the cardiac cycle, normally the atria contract and also push blood in the ventricles. Human heart performs highly specific function although it is small in size. If you took all of the human blood vessels out of an average kids, and then it laid in one line, the blood vessel line would be 60,000 miles long, an and adults blood vessels would be more than 90,000 miles. Once the blood is purified and oxygenated, it travels back to the left atrium through the pulmonary veins. Some diets are mainly responsible for this heartburn condition. This heart test can help diagnose many heart conditions. When not treated early, heart valve disease can lead to the congestive heart failure. Carbon dioxide leaves the body when you exhale. Brachiocephalic Artery – This artery is responsible for transporting blood from the aorta to the arms, neck, and head. This high oxygenates blood the returns into the left side of our heart and again it pumped into the whole part of our body. The heart muscle is very special as it pumps blood around our body. It is a template to be used by teachers and students studying medicine. We cover everything from solar power cell technology to climate change to cancer research. The pericardium is types of serous membrane which produces serous fluid to lubricate the heart and also prevent friction between the ever beating heart and also its surrounding organs. This note sends electrical impulses to the muscles of the heart, and when the myocardium receives the signals, they contract. The average human heart weighs between 6 and 11 ounces. The function of heart is quite complex, but you can understand things better through the heart diagram labeled below. It is also the biggest artery in the human body. All rights reserved. Sometime heart becomes large due to some disease. This prevents blood from flowing backward into the atrium while the ventricle contracts. The human heart usually weighs somewhere between 10 to 12 ounces in men and between 8 to 10 ounces in women, and in terms of size is roughly the size of the fist. This condition is also known as cardiac arrest. These types of blockage is usually called heart attack. Brachiocephalic veins – The brachiocephalic veins join together to compose the superior venae cavae. The blood capillaries are connected to the arteries to veins and finally the veins carry the blood back into the human heart. The heart has to work so harder to balance for the damage valve and this condition can weaken the heart and also increase the risk to develop heart failure or sudden cardiac arrest. The myocardium is the middle portion of the outer wall, and these muscles are what causes the contraction of the heart, contracting upon reception of electrical impulses from the sinoatrial node. The different parts of heart in heart diagram are discussed below: Below is an image of the outside of a normal, healthy human heart diagram.