The SA node responds to the body's overall need for blood and increases the heart rate when necessary, such as during exercise, emotional excitement, or illness such as fever. The SA node is sometimes called the “natural pacemaker” of the heart. ...
2.a person, an organization, etc, regarded as being the leader in a particular field of activity 3.(Anatomy) Also called:cardiac pacemakera small area of specialized tissue within the wall of the right atrium of the heart whose spontaneous electrical activity initiates and controls the beat of...
1) The pacemaker rhythm that determines heart rate is called ___ rhythm. sinus 2) The ECG ___ wave interval represents ventricular repolarization. T 3) The ___ layer of the serous pericardium covers the heart. visceral 4) The ___ valve of the heart has three valves with chordae tendin...
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...
The Human Heart The heart is a muscular organ that forms part of the cardiovascular system. The heart is located in the thoracic cavity, in the region called the mediastinum. The pumping action of the heart caused by depolarization a...
2.a person, an organization, etc, regarded as being the leader in a particular field of activity 3.(Anatomy) Also called:cardiac pacemakera small area of specialized tissue within the wall of the right atrium of the heart whose spontaneous electrical activity initiates and controls the beat of...
They act also to conduct impulses throughout the heart, in a rapid and coordinated fashion1. The main components of the cardiac conduction system are the sinus node of the right atrium, which is the primary pacemaker; the atrioventricular conduction axis, which normally forms the only pathway ...
1. 1. The heartbeat of an adult beetle, Allomyrina, initiates from the rear portion of the heart, the impulse propagating forward, however, sometimes generating from the anterior region, and taking a reversed direction. 2. 2. The heart is considered to be myogenic, because of the absence ...
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Starting the heart One of the first sci-fi novels, Frankenstein by Mary Shelley has had a huge impact on science. Earl Bakken, the inventor of the pacemaker (起搏器), a device placed into the chest that helps the heart to pump blood using small electrical impulses, was inspired by the ...