The heart is enclosed within a fluid-filled sac called the pericardium. The pericardium is a protective covering that produces fluid, which lubricates the heart and prevents friction between the heart and the surrounding organs.
What are the coverings of the heart?
The pericardium, also called pericardial sac, is a double-walled sac containing the heart and the roots of the great vessels. It has two layers, an outer layer made of strong connective tissue (fibrous pericardium), and an inner layer made of serous membrane (serous pericardium).
What is the function of each layer of the heart?
The heart is composed of three layers: the epicardium (outer layer) which prevents excess expansion or movement of the heart, the myocardium (middle layer) which initiates contractions driving the cardiac cycle, and the endocardium (inner layer) that lines the cavities and valves.
What is the function of the Endocardium?
The endocardium is a thin, smooth membrane which lines and gives the glistening appearance to the inner surface of the heart; it assists in forming the valves by its reduplications, and is continuous with the lining membrane of the large bloodvessels.
What are the 3 layers of heart?
The walls of the heart are composed of three layers:
- Epicardium – the outer layer.
- Myocardium – the middle, muscular layer.
- Endocardium – the inner layer.
Which is the deepest layer of the heart?
The myocardium is the thickest layer of the heart wall, with its thickness varying in different parts of the heart. The myocardium of the left ventricle is the thickest, as this ventricle is responsible for generating the power needed to pump oxygenated blood from the heart to the rest of the body.
What are the 4 layers of the heart?
The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium.
Which is the most important layer of heart wall?
Myocardium. The middle layer of the heart wall is the myocardium—the muscle tissue of the heart and the thickest layer of the heart wall. It is composed of cardiac muscle cells, or cardiomyocytes. Cardiomyocytes are specialized muscle cells that contract like other muscle cells, but differ in shape.
What is Chambers of heart?
A normal heart has two upper and two lower chambers. The upper chambers, the right and left atria, receive incoming blood. The lower chambers, the more muscular right and left ventricles, pump blood out of your heart. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings.
What is the difference between endocardium and pericardium?
The endocardium underlies the much more voluminous myocardium, the muscular tissue responsible for the contraction of the heart. The outer layer of the heart is termed epicardium and the heart is surrounded by a small amount of fluid enclosed by a fibrous sac called the pericardium.
How does the Endocardium protect the heart?
Anatomic function: A tissue covering the inside of the heart, the endocardium keeps the blood flowing through the heart separate from the myocardium, or cardiac muscles. It also lines the valves, which open and close to regulate blood flow through the chambers of the heart.
What are the three functions of the pericardium?
Its major functions include: maintenance of adequate cardiac position, separation from the surrounding tissues of the mediastinum, protection against ventricular dilatation, maintenance of low transmural pressure, facilitation of ventricular interdependence and atrial filling.
What is largest artery in the body?
The aorta is the large artery that carries oxygen-rich blood from the left ventricle of the heart to other parts of the body.
How many walls are there in heart?
The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.
|Artery||Aorta, pulmonary trunk and right and left pulmonary arteries, right coronary artery, left main coronary artery|
What is the structure of heart?
The heart is divided into four chambers consisting of two atria and two ventricles; the atria receive blood, while the ventricles pump blood. The right atrium receives blood from the superior and inferior vena cavas and the coronary sinus; blood then moves to the right ventricle where it is pumped to the lungs.