What is the pacemaker of the heart? What happens to the blood when the heart contracts and relaxes? Explain the condition of heart arrhythmia. What is meant by the following terms: A. mitral valve prolapse B. calcific aortic stenosis C. ventricular fibrillation ...
The sinoatrial (SA) nodes are areas of the heart's atrium that act as the heart's pacemaker. Impulses from the SA node cause the heart’s chambers to contract. Purkinje fibers receive their impulses from the SA node and move the impulse through the heart’s muscles. Just below the atrium...
An implantable pacemaker, also known as an artificial pacemaker, is an internal medical device that regulates the beating of the heart to a sufficient rate that meets the body's needs. This type of pacemaker is used in patients whose heart rate is too fast, a condition called tachycardia; wh...
The heart is the circulatory system's primary organ. It is responsible for driving blood throughout the body, thereby providing the body with essential components such as oxygen.Answer and Explanation: The heart is made of three primary layers. The innermost layer is the endocardium, which is ...
What is the purpose of heart valves?Heart:The heart is the main organ of the circulatory system or cardiovascular system. The heart is a muscular organ that is present in most animals, pumps blood through the circulatory system. In mammals and birds, the heart has 4 chambers: ...
heart rhythmelectrical pacingThe function of a pacemaker is to provide a cardiac rhythm that maintains a cardiac output adequate for normal activity, and in extreme situations, an output compatible with life. As such, a pacemaker may be required for maintenance of a normal cardiac output in ...
"It's kind of like a pacemaker for the heart, but instead, we use it for the brain," says Dr. Richard Zimmerman, a Mayo Clinic neurosurgeon. Dr. Zimmerman is talking about a device called a responsive neurostimulator, or RNS therapy. It's implanted in a patient's skull with electrodes...
What is the natural pacemaker of the heart called? During which stage of the cardiac cycle is the blood pressure in the aorta the highest? a) Atrial contraction and ventricular filling b) Isovolumetric contraction c) Ventricular ejection d) Isovolumetric relaxation...
Pacemaker cells generate an electrical impulse approximately 70 times per minute when the heart is at rest and up to 160 times each minute during vigorous exercise. All of the heart’s cells are capable of acting as a pacemaker cell. The cells located in the sinoatrial node, however, are ...
What Causes an Enlarged Heart? Sometimes, damage to the heart, or related conditions, can cause an enlarged heart. Other times, there is no known reason why the heart enlarges and gets weak. Your doctor may refer to this asidiopathic dilated cardiomyopathy. The most common causes of a weake...