The human heart is a complex and vital organ that is responsible for pumping blood throughout the body. It is located in the thoracic cavity, between the lungs, and is protected by the ribcage. The heart is divided into four chambers: the left and right atria, and the left and right ventricles. The atria are the upper chambers of the heart, while the ventricles are the lower chambers.
The heart has a unique external structure that helps it to function effectively. The outer layer of the heart is known as the epicardium, which is a thin layer of tissue that covers the surface of the heart. The middle layer of the heart is known as the myocardium, which is a thick layer of muscle tissue that is responsible for contracting and relaxing to pump blood through the heart. The inner layer of the heart is known as the endocardium, which is a thin layer of tissue that lines the inside of the heart and helps to prevent damage to the heart muscle.
The heart is also surrounded by a network of blood vessels, including the aorta, the vena cava, and the pulmonary artery and vein. These blood vessels transport oxygenated and deoxygenated blood to and from the heart, respectively.
The heart has a unique system of electrical conduction that helps to coordinate the contraction of the heart muscle. This system includes the sinoatrial (SA) node, the atrioventricular (AV) node, and the Purkinje fibers. The SA node is located in the right atrium and acts as the heart's natural pacemaker, sending electrical impulses that stimulate the contraction of the heart muscle. The AV node is located in the interatrial septum and helps to coordinate the contraction of the atria and ventricles. The Purkinje fibers are located in the ventricles and help to transmit the electrical impulses throughout the heart muscle.
In summary, the human heart has a complex external structure that is essential for its function. It is made up of three layers of tissue, is surrounded by a network of blood vessels, and has a unique system of electrical conduction. All of these components work together to ensure that the heart is able to pump blood efficiently and effectively throughout the body.
The external structure of human heart
Just after the filled of ventricles, relaxation starts in the walls of auricles due to this deoxygenated blood rushes from veins to right auricle and oxygenated blood through pulmonary vein in to left auricle Fig. Internal structures are the inner pieces and parts that keep organisms alive, help them grow, and help them reproduce. Chordate tendinae and the papillary muscle prevent the backflow of the blood from the valve. Veins have valves in their inner lining. Two large vessels, superior vena cava, and inferior vena cava open into the right atrium carrying the deoxygenated blood from the upper and lower part of the body respectively. The pulmonary artery opens from the right ventricle that carries the blood to the lungs and the aorta arises from the left ventricle carrying the oxygenated blood throughout the body.
Human Heart Anatomy
Exploring in Yahoo I eventually stumbled upon this website. Due to this, the blood is not transferred into the blood vessels. Handbook of Cardiac Anatomy, Physiology, and Devices. Operative Anatomy of the Heart. Subclavian arteries : Supply blood to the arms. Similarly, right and left coronary arteries arise from the systemic aorta which carries the oxygenated blood to the heart. The bicuspid valve resembles mitre or topi of bishop, hence, also called Mitral valve.
Internal and external structure of the Human Heart
It consists of the two mitral leaflets, anterior and posterior sited within the mitral annulus. In a nutshell, the plays a vital role in supplying oxygen, and nutrients and removing carbon dioxide and other wastes from the body. Name the chambers of the heart. What are the posterior relations of base of Heart? The right atrium is comparatively larger and thinner than that of the left atrium, receiving the deoxygenated blood from the superior and inferior vena cava. It travels anteriorly and slightly to the right to reach the atrioventricular groove; it enters the groove and follows it path to reach the cardiac crux, the place where atrioventricular groove meets the interatrial and interventricular grooves at the posterior surface of the heart. The walls of left ventricle are much thicker as it supplies blood to large distance and up to the brain against gravity. The human heart External and internal structure.
What is internal and external structure of heart?
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The heart is enclosed in a thin though transparent sac, The Pericardium. This fluid protects the heart from external pressure, push, shock and reduces friction during the heart beat and facilitates free heart contraction. One end is attached to the cusps of atrioventricular valves and the other end to the papillary muscles of the ventricles. In 1953 he received an M. Node and spreads over both the auricles resulting the contraction of both auricles, simultaneously, and blood is pushed into ventricles of their sides through atrio-ventricular valves.
