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Four chambers
- The heart is composed of smooth muscle. It has four chambers which contract in a specific order, allowing the human heart to pump blood from the body to the lungs and back again with high efficiency.
biologydictionary.net/heart/Heart (Human Anatomy): Overview, Function & Structure | Biology
Your heart contains four muscular sections (chambers) that briefly hold blood before moving it. Electrical impulses make your heart beat, moving blood through these chambers. Your brain and nervous system direct your heart’s function. Function. What is the function of the heart? Your heart’s main function is to move blood throughout your body.
Oct 4, 2019 · In most people, the heart is located on the left side of the chest, beneath the breastbone. The heart is composed of smooth muscle. It has four chambers which contract in a specific order, allowing the human heart to pump blood from the body to the lungs and back again with high efficiency.
- Myocardium. Myocardium is the contractile muscle layer which performs the mechanical action of pumping blood into the body. It is a muscle that functions involuntarily, that is, without the need for a nervous impulse coming from the nervous system.
- Endocardium. The endocardium is the lining of the different chambers of the heart. It consists mainly of endothelial cells, similar to the rest of the blood vessels, as well as a layer of lax connective tissue.
- Pericardium. The pericardium is a fibrous membrane that surrounds the heart and the great blood vessels that connect to it, as isolation and protection.
- Right Auricle. The right atrium is the cavity in the upper-right part of the heart, above the right ventricle. It is reached by the superior vena cava and the inferior vena cava.
Nov 10, 2024 · Last updated on November 10, 2024. The heart is a muscular organ that pumps blood throughout the body via the circulatory system. It is approximately the size of a fist and consists of four chambers: two atria and two ventricles. The heart is composed of specialized muscle tissue, known as myocardium, and is encased within a double-layered ...
Heart Chambers, Valves, Vessels, Wall and Conduction System. The heart is made up of four chambers. The upper two chambers are called atria (singular: atrium) and the lower two are known as ventricles (singular: ventricle). Muscular walls, called septa or septum, divide the heart into two sides.
Feb 27, 2019 · Each day, the average human heart beats about 100,000 times, pumping 2,000 gallons of blood through the body. That's a lot of work for an organ no bigger than a large fist and weighing 8 to 12 ounces.
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Jun 11, 2024 · The heart has three layers of tissue: Endocardium: The innermost layer, provides a smooth lining for chambers and valves. Myocardium: The middle layer, composed of muscle tissue that enables heart contractions. Epicardium: The outermost layer protects the heart and reduces friction with surrounding structures.
