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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.
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. The average human heart weighs between...
Aug 26, 2013 · Heart Anatomy. Size, Location, and orientation. The heart is around the size of a fist and weighs between 250-350 grams (less than a pound). Enclosed within the mediastinum, the medial cavity of the thorax, the heart extends obliquely from the second rib to the fifth intercostal space.
- 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...
Feb 24, 2021 · A (Atria) comes before V (Ventricles), so the atria will be located on top/before the ventricles. Image: Diagram of the cardiac anatomy showing the top chambers (atria) and bottom chambers (ventricles). Use the alphabet (A before V) to remember the atria are on top and the ventricles are on the bottom.
The heart is located beneath the rib cage slightly to the left of the center of the chest between the lungs and above the diaphragm. A healthy adult heart is approximately the size of a closed fist.
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Jan 11, 2021 · A. This frontal view shows the right and left surfaces of the heart. The left anterior descending coronary artery buried in epicardial fat marks the plane of the ventricular septum. B. The obtuse and acute margins of the ventricles are demonstrated in this apical view. Figure 3.
