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- The upper two heart chambers are called atria. Atria are separated by an interatrial septum into the left atrium and the right atrium. The lower two chambers of the heart are called ventricles. Atria receive blood returning to the heart from the body and ventricles pump blood from the heart to the body.
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Aug 26, 2013 · Location of the heart in the mediastinum. The superficial epicardium is the visceral layer of the serous pericardium. The middle layer is the myocardium and is composed mainly of cardiac muscle and forms the bulk of the heart.
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Mar 10, 2015 · The heart is divided into four chambers: two atria and two ventricles. Blood is transported through the body via a complex network of veins and arteries.
Aug 17, 2023 · Revise the anatomy of the atria and the other parts of the heart with our heart diagrams, quizzes and labeled worksheets. Once ventricular contraction stops and the pressure within the atria overcomes the pressure within the ventricles, the atrioventricular valves open and the blood passes into the ventricles.
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The atria (plural of atrium) are where the blood collects when it enters the heart. The ventricles pump the blood out of the heart to the lungs or around the body. The septum separates the...
- Pericardium
- Structure of The Heart Wall
- Chambers of The Heart
- Valves of The Heart
- Conduction System of The Heart
The heart sits within a fluid-filled cavity called the pericardial cavity. The walls and lining of the pericardial cavity are a special membrane known as the pericardium. Pericardium is a type of serous membrane that produces serous fluid to lubricate the heart and prevent friction between the ever beating heart and its surrounding organs. Besides ...
The heart wall is made of 3 layers: epicardium, myocardium and endocardium. 1. Epicardium. The epicardium is the outermost layer of the heart wall and is just another name for the visceral layer of the pericardium. Thus, the epicardium is a thin layer of serous membrane that helps to lubricate and protect the outside of the heart. Below the epicard...
The heart contains 4 chambers: the right atrium, left atrium, right ventricle, and left ventricle. The atria are smaller than the ventricles and have thinner, less muscular walls than the ventricles. The atria act as receiving chambers for blood, so they are connected to the veins that carry blood to the heart. The ventricles are the larger, strong...
The heart functions by pumping blood both to the lungs and to the systems of the body. To prevent blood from flowing backwards or "regurgitating" back into the heart, a system of one-way valves are present in the heart. The heart valves can be broken down into two types: atrioventricular and semilunar valves. 1. Atrioventricular valves. The atriove...
The heart is able to both set its own rhythm and to conduct the signals necessary to maintain and coordinate this rhythm throughout its structures. About 1% of the cardiac muscle cells in the heart are responsible for forming the conduction system that sets the pace for the rest of the cardiac muscle cells. The conduction system starts with the pac...
Right atrium. The right atrium lies among the two venae cavae, behind and somewhat right of the sternum. It is right and anterior to the left atrium. [8] . It consists of the venous component (or sina venarum), which is the main, smooth part of the right atrium (auricula or atrium proper).
Jun 11, 2024 · The heart's electrical signal originates in pacemaker cells within the sinus node (SN), which is located in the right atrium. This signal moves through the atria, making them contract and push blood into the ventricles.
