Describe the mechanism by which human heart beat is intiated and controlled?
Answers
Answer:
The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles. The SA node sets the rate and rhythm of your heartbeat.
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Answer:
The heart beat is initiated by a group of specialised muscle cells in the right atrium called the sinoatrial node
The sinoatrial node acts as a pacemaker
Explanation:
The contraction of the heart is myogenic – meaning that the signal for cardiac compression arises within the heart tissue itself
In other words, the signal for a heart beat is initiated by the heart muscle cells (cardiomyocytes) rather than from brain signals
Within the wall of the right atrium are a specialised cluster of cardiomyocytes which direct the contraction of heart muscle tissue
This cluster of cells are collectively called the sinoatrial node (SA node or SAN)