Sinoatrial Node (SA node)
answer it ya self feck head
The sinoatrial (SA) node is a group of cells in the heart that acts as the natural pacemaker, initiating electrical impulses that regulate the heartbeat. It can set a constant heart rate of about 100 beats per minute in the absence of any other influences.
The rate and pace of the heart are set by the SA node. There are backup systems in place if the SA node fails to do its job.
Yes, heart cells contain a complete set of chromosomes and DNA. However, during maturation, specific genes are expressed and others are silenced, leading to the development of specialized heart cell functions.
Sinus rhythm
Pacemaker cells, also known as the sinoatrial (SA) node, are specialized cells in the heart that generate electrical impulses to regulate its rhythm. These cells initiate each heartbeat and set the pace for the entire heart.
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Pacemakers are set by the surgeon-physician at the time it is implanted. Most times, the pacemaker is simply set to a normal heart rate (around 70-80 beats per minute). The primary function of the pacemaker is to restore a more regular beat when the heart cannot maintain a normal heart rate. You should consult your physician-surgeon for particulars about your pacemaker, its use, function, and signs/symptoms to watch for after the pacemaker is implanted.
Target heart rate (THR) refers to the ideal heart rate range during exercise that helps maximize cardiovascular benefits while minimizing risks. It is typically calculated as a percentage of an individual's maximum heart rate, which can be estimated by subtracting their age from 220. For optimal aerobic benefits, the target heart rate is usually set between 50% to 85% of the maximum heart rate. Monitoring this rate helps ensure effective and safe workouts.
The contraction of heart (cardiac) muscle in all animals with hearts is initiated by chemical impulses. The rate at which these impulses fire controls the heart rate. The cells that create these rhythmical impulses are called pacemaker cells, and they directly control the heart rate.
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Pacesetter cells are specialized cells in the heart that generate electrical impulses, initiating each heartbeat. They set the rhythm for the heart and coordinate the contraction of heart muscle cells, ensuring that the heart beats in a coordinated and efficient manner to pump blood throughout the body.