What is the myocardium? The myocardium is the heart muscle, the working muscles of the heart. It is striated like skeletal muscle, but thinner and with a special structure: The surface of the cardiac muscle fibers is covered by a lattice fiber network, and the nuclei are longer than in skeletal muscle cells and are … Myocardium
Synonyms Heart sounds, heart signs, heart rate, medical: Cor Introduction The heart ensures the blood circulation of the whole body through constant contraction and relaxation, so that all Oragne is supplied with oxygen and nutrients and decomposition products are removed. The pumping action of the heart takes place in several phases. Heart action In order … Function of the heart
Excitation formation and conduction system The work of the heart/function of the heart is triggered and controlled by electrical impulses.This means that the impulses are created somewhere and are passed on. These two functions are performed by the excitation and conduction system. The sinus node (Nodus sinuatrialis) is the origin of the electrical impulses. It … Excitation formation and conduction system | Function of the heart
Sinus node The sinus node, rarely also called Keith-Flack node, consists of specialized heart muscle cells and is responsible for the contraction of the heart by transmitting electrical potentials, and is thus the clock of the heartbeat. The sinus node is located in the right atrium just below the orifice of the right vena cava. … Sinus node | Function of the heart
Control of the heart action This whole process works automatically – but without a connection to the nervous system of the body, the heart has hardly any possibilities to adapt to the changing requirements (= changing oxygen demand) of the whole organism. This adaptation is mediated via the heart nerves from the central nervous system … Control of the heart action | Function of the heart
Heart Rate Calculation If you want to train in your individual optimal heart rate zone you should be able to calculate your optimal heart rate. The calculation is done according to the so-called Karvonen formula, where the resting heart rate is subtracted from the maximum heart rate, the result is multiplied by 0.6 (or 0.75 … Heart Rate Calculation | Function of the heart
There is a variety of heart diseases, which often have many different causes. Inflammations, injuries and changes in age can change and damage the heart. Classification of heart diseases In the following you will find the most common diseases of the heart divided into: Structural changes of the heart Vascular diseases of the heart Infectious … An overview of the diseases of the heart
Definition The heart muscle (myocardium) is a special type of muscle that is only found in the heart and forms most of the wall of the heart. Through its regular contractions, it is responsible for the blood being squeezed out of the heart (the heart’s task) and pumped through our body, making it vital. Structure … Myocardium
Excitation conduction and contraction The electrical excitation of the heart muscle is effected by a cardiac conduction system, which, as with smooth muscles, is based on the presence of spontaneously discharging (depolarizing) pacemaker cells. The first instance of this system is the so-called sinus node, the primary pacemaker. Here, the heart rate is set at … Excitation conduction and contraction | Myocardium
Properties of the heart muscle With humans a heart muscle cell is on the average about 50 to 100 μm long and 10 to 25 μm broad. The left ventricle is the chamber from which blood is ejected into the body’s circulation.This must therefore provide a much higher pumping capacity than the right ventricle, which … Properties of the heart muscle | Myocardium
Heart muscle thickened If the heart muscles thicken, this is often a consequence of chronic overloading of the heart.If one speaks of the fact that the heart muscle is thickened (hypertrophy), the left ventricle is usually meant. This is usually between 6 and 12 millimeters thick. Due to chronic overloading in cases of high blood … Heart muscle thickened | Myocardium
Definition The sinus node (also: sinuatrial node, SA node) is the primary electrical pacemaker of the heart and is largely responsible for heart rate and excitation. Function of the sinus node The heart is a muscle that pumps on its own, which means it is not dependent on nerves like most muscles. This is because … Sinus node
