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Feb 27, 2019 · This story was updated on January 31, 2020. Each day, the average human heart beats about 100,000 times, pumping 2,000 gallons of blood through the body.
- Myocardium
- Endocardium
- Pericardium
- Right Auricle
- Right Ventricle
- Tricuspid Valve
- Pulmonary Valve
- Left Auricle
- Left Ventricle
- Mitral Valve
Myocardium is the contractile muscle layerwhich 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. The contractile signal is generated in the heart itself. The myocardium is more abundant in the lower part of the ...
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.
The pericardium is a fibrous membrane that surrounds the heartand the great blood vessels that connect to it, as isolation and protection. We can think of the pericardium as a large bag, made up of two layers: Serous pericardium and fibrous pericardium. Its viscosity and protective capacity allow the heart to move freely without being affected by n...
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. carry to the heart the blood that has already circulated through the bodyrich in carbon dioxide and poor in oxygen. The blood reaches the right atrium before going down into the right ve...
The right ventricle is attached to the right atrium, from which it receives blood. The right ventricle is also connected to the pulmonary artery, which will be responsible for carrying blood from the right ventricle to the lungs, where gas exchange will occur. It contracts slightly before the left ventricle.
Between the atria and the ventricles, as well as between the ventricles and the arteries, we find the valves. They are made up of connective tissue and their main function is that of avoid blood refluxand isolate both the atria and the ventricles. They open only when blood is pumped through them, and close immediately by the contractile action of t...
The pulmonary valve is the one that connects the right ventricle to the pulmonary artery. It opens when the right ventricle contracts, allowing blood to flow into the artery.
The left atrium receives blood from the pulmonary veins (there are 4, 2 coming from the right lung and 2 coming from the left lung). From the left atrium, blood flows into the left ventricle through the mitral valve.
The left ventricle contains the strongest muscles in the whole heart. From this ventricle, blood is pumped into the aortic artery, which divides to water the rest of the body’s blood. The blood pressure generated by this ventricle must be much higher than that generated by the right ventricle.
The mitral valve separates the left atrium from the left ventricle. Like the tricuspid valve, it is also attached to the ventricle through tendons and papillary muscles, which prevent its opening when the ventricle is empty as well as its opening when the ventricle contracts.
Oct 31, 2024 · The heart cavity is divided down the middle into a right and a left heart, which in turn are subdivided into two chambers. The upper chamber is called an atrium (or auricle), and the lower chamber is called a ventricle. The two atria act as receiving chambers for blood entering the heart; the more muscular ventricles pump the blood out of the ...
- The Editors of Encyclopaedia Britannica
- In humans, the heart is situated between the two lungs and slightly to the left of center, behind the breastbone. It rests on the diaphragm, the mu...
- The heart consists of several layers of a tough muscular wall, the myocardium. A thin layer of tissue, the pericardium, covers the outside, and ano...
- The pumping of the heart, or the heartbeat, is caused by alternating contractions and relaxations of the myocardium. These contractions are stimula...
- The rhythmic noises accompanying the heartbeat are called heart sounds. The two distinct sounds are heard, a low, slightly prolonged “lub” (first s...
The heart is a muscular organ found in most animals.This organ pumps blood through the blood vessels. [1] Heart and blood vessels together make the circulatory system. [2] The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. [3]
Nov 10, 2024 · The base of the heart is its broader upper part and is primarily formed by the atria, especially the left atrium. It faces posteriorly and is situated at the level of the 2nd intercostal space. The base is where the great vessels – the aorta, pulmonary trunk, and superior vena cava – enter or exit the heart. Surfaces of the Heart:
Jun 11, 2024 · Atrial Septal Defect (ASD): This is a congenital (present at birth) heart defect where there is an abnormal opening in the septum (wall) between the atria (upper chambers) of the heart. ASDs can vary in size and may lead to abnormal blood flow between the atria, which can cause permanent damage to the lung blood vessels.
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The heart is a muscular organ situated in the mediastinum.It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system. The left and right sides of the heart have different functions: the right side receives de-oxygenated blood through the superior and inferior venae cavae and pumps blood to the lungs through the pulmonary artery, and the left ...
