Datei:Diagram of the human heart (cropped) ecce2008.eu aus Wikipedia, der freien Enzyklopädie. Zur Navigation springen Zur Suche springen. Datei; Dateiversionen. South Med J Dong E, Shumway NE () Current results of human heart transplantation. World J Surg 1: Downie HG () Homotransplantation. Kramer TC() The partitioning of the truncus und conus and the formation of the membranous portion of the interventricular septum in the human heart.
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Human Heart, Cosmic Heart: A Doctor's Quest to Understand, Treat, and Prevent Cardiovascular Disease | Cowan, Thomas | ISBN: 22/jan/ - The Human Heart Chart - Anatomy and Physiology | Cardiovascular System | The anatomy and physiology of the human heart is colorfully and. Übersetzung im Kontext von „human heart“ in Englisch-Deutsch von Reverso Context: The typical human heart beats 35 million times in a year. Researchers from three continents have produced a first extensive draft of a cell atlas of the human heart to understand how this vital organ. Datei:Diagram of the human heart (cropped) ecce2008.eu aus Wikipedia, der freien Enzyklopädie. Zur Navigation springen Zur Suche springen. Datei; Dateiversionen. Many translated example sentences containing "of the human heart" – German-English dictionary and search engine for German translations. () Decreased catecholamine sensitivity and ß-adrenergic receptor density in failing human hearts. N Engl J Med – 4. Brodde OE () ß- and.
South Med J Dong E, Shumway NE () Current results of human heart transplantation. World J Surg 1: Downie HG () Homotransplantation. Übersetzung im Kontext von „human heart“ in Englisch-Deutsch von Reverso Context: The typical human heart beats 35 million times in a year. Datei:Diagram of the human heart (cropped) ecce2008.eu aus Wikipedia, der freien Enzyklopädie. Zur Navigation springen Zur Suche springen. Datei; Dateiversionen.
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.
The conduction system starts with the pacemaker of the heart—a small bundle of cells known as the sinoatrial SA node. The SA node is located in the wall of the right atrium inferior to the superior vena cava.
The SA node is responsible for setting the pace of the heart as a whole and directly signals the atria to contract.
The signal from the SA node is picked up by another mass of conductive tissue known as the atrioventricular AV node. The AV node is located in the right atrium in the inferior portion of the interatrial septum.
The AV bundle is a strand of conductive tissue that runs through the interatrial septum and into the interventricular septum.
The AV bundle splits into left and right branches in the interventricular septum and continues running through the septum until they reach the apex of the heart.
Branching off from the left and right bundle branches are many Purkinje fibers that carry the signal to the walls of the ventricles, stimulating the cardiac muscle cells to contract in a coordinated manner to efficiently pump blood out of the heart.
The cardiac cycle includes all of the events that take place during one heartbeat. There are 3 phases to the cardiac cycle: atrial systole, ventricular systole, and relaxation.
Deoxygenated blood returning from the body first enters the heart from the superior and inferior vena cava. The blood enters the right atrium and is pumped through the tricuspid valve into the right ventricle.
From the right ventricle, the blood is pumped through the pulmonary semilunar valve into the pulmonary trunk. The pulmonary trunk carries blood to the lungs where it releases carbon dioxide and absorbs oxygen.
The blood in the lungs returns to the heart through the pulmonary veins. From the pulmonary veins, blood enters the heart again in the left atrium.
The left atrium contracts to pump blood through the bicuspid mitral valve into the left ventricle. The left ventricle pumps blood through the aortic semilunar valve into the aorta.
From the aorta, blood enters into systemic circulation throughout the body tissues until it returns to the heart via the vena cava and the cycle repeats.
The electrocardiogram also known as an EKG or ECG is a non-invasive device that measures and monitors the electrical activity of the heart through the skin.
The EKG produces a distinctive waveform in response to the electrical changes taking place within the heart. The first part of the wave, called the P wave, is a small increase in voltage of about 0.
The QRS complex corresponds to the depolarization of the ventricles during ventricular systole. The atria also repolarize during the QRS complex, but have almost no effect on the EKG because they are so much smaller than the ventricles.
The T wave represents the ventricular repolarization during the relaxation phase of the cardiac cycle. Variations in the waveform and distance between the waves of the EKG can be used clinically to diagnose the effects of heart attacks, congenital heart problems, and electrolyte imbalances.
During a normal heartbeat, these sounds repeat in a regular pattern of lubb-dupp-pause. Any additional sounds such as liquid rushing or gurgling indicate a structure problem in the heart.
The most likely causes of these extraneous sounds are defects in the atrial or ventricular septum or leakage in the valves.
Cardiac output CO is the volume of blood being pumped by the heart in one minute. Stroke volume is the amount of blood pumped into the aorta during each ventricular systole, usually measured in milliliters.
Heart rate is the number of heartbeats per minute. The average heart can push around 5 to 5. Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium.
Of course, the heart is also a muscle, so it needs a fresh supply of oxygen and nutrients, too, Phillips said. The left main coronary artery, on one side of the aorta, branches into the left anterior descending artery and the left circumflex artery.
The right coronary artery branches out on the right side of the aorta. A heart attack is distinct from cardiac arrest, which is a sudden loss of heart function that usually occurs as a result of electrical disturbances of the heart rhythm.
A heart attack can lead to cardiac arrest, but the latter can also be caused by other problems, he said. The heart contains electrical "pacemaker" cells, which cause it to contract — producing a heartbeat.
In people with an irregular heartbeat, or atrial fibrillation, every cell tries to be the band leader, he said, which causes them to beat out of sync with one another.
A healthy heart contraction happens in five stages. In the first stage early diastole , the heart is relaxed. Then the atrium contracts atrial systole to push blood into the ventricle.
Next, the ventricles start contracting without changing volume. Then the ventricles continue contracting while empty.
Finally, the ventricles stop contracting and relax. Then the cycle repeats. Live Science.