AV node: Control center between the atrium and ventricle The AV node is an area of dense, connective tissue-rich muscle fiber networks in the right atrium close to the border with the ventricle. It is the only conductive connection between the atrium and ventricle: the electrical impulses coming from the sinus node via the atrial … AV Node
The heart is composed of four cavities, two ventricles and two atria. The atrium is also called the cardiac atrium or atrium cordis. What is the atrium of the heart? The heart is a hollow muscular organ responsible for supplying blood to the entire body. The human heart is located in the pericardium in the … Atrium of the Heart: Structure, Function & Diseases
Diastole is the relaxation phase of the heart muscle during which blood flows from the atria into the ventricles during the early filling phase when the leaflet valves are open. In the subsequent late filling phase, further blood is actively delivered to the ventricles by contraction of the atria. In the systole that follows, blood … Diastole: Function, Tasks, Role & Diseases
Excitation of the sinus muscle in the heart is transmitted to the working muscles of the atria, but these are electrically insulated from the ventricles, so that transmission of excitation at this point can occur only through the conduction of excitation by the atrioventricular node. Transmission through the muscle cell-containing atrioventricular node is delayed, thus … Atrioventricular Node: Structure, Function & Diseases
Cardiac rhythm is the complete repetitive sequence of heartbeats, including electrical excitation and heart muscle contractions. In people with healthy cardiovascular systems, the atria contract first, pumping blood into the ventricles, which then contract, pushing their blood into the great systemic circulation and into the pulmonary circulation. Normally, the complete heartbeat sequences move in a … Heart Rhythm: Function, Tasks, Role & Diseases
Heart rate is the number of heartbeat cycles per minute, and a heartbeat cycle, also called cardiac action, includes the beating phases of systole and diastole. Systole refers to the contraction of the ventricles including blood ejection phase and diastole refers to the resting phase of the ventricles with simultaneous contraction of the atria and … Heart Rate: Function, Tasks, Role & Diseases
Sinus rhythm is the term used to describe the normofrequency and regular heartbeat in humans. This rhythm is formed in the sinus node. What is sinus rhythm? Sinus rhythm is the term used to describe the normofrequency and regular heartbeat in humans. Sinus rhythm is the normal heart rhythm. The number of heartbeats per minute … Sinus Rhythm: Function, Tasks, Role & Diseases
Glycosides are organic or synthetic substances that result from the reversible condensation of two or more ring-shaped sugars or from the condensation of a sugar with a wide variety of alcohols via a so-called glycosidic bond, in each case splitting off an H2O molecule. Glycosides are synthesized by many plants in an almost incalculable variety, … Glycosides: Effects, Uses & Risks
The junctional replacement rhythm of the heart sets in as soon as the normal rhythm generator, the sinoatrial node in the right atrium, fails or the frequency input falls below about 60 Hz. Stimulus formation occurs in the junctional zone of the atrioventricular (AV) node, His bundle, and right atrium because the AV node itself … Junctional Replacement Rhythm: Function, Tasks, Role & Diseases
Pacing potential is the action potential of the pacemaker cells in the heart. It is a prerequisite for a regular heartbeat and thus elementary for cardiac function. What is the pacemaker potential? Pacing potential is the action potential of the pacemaker cells in the heart. The normal heart rate at rest in a healthy person … Pacemaker Potential: Function, Tasks, Role & Diseases
Ventricular replacement rhythm is the electrical self-excitation of the ventricular muscles. When ventricular replacement rhythm occurs, the patient has a serious cardiac arrhythmia due to failure of the two upstream excitation centers, the sinus node and AV node. The body tries to ensure survival through the ventricular replacement rhythm. The ventricular beating rate is then … Ventricular Replacement Rhythm: Function, Role & Diseases
The His bundle is composed of special cardiac muscle cells and, together with the sinus node and the atrioventricular (AV) node, is part of the excitation conduction system of the heart muscles. The His bundle provides the only electrical connection from the atria to the ventricles and, in the event of failure of the sinus … His Bundle: Structure, Function & Diseases
