ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Causes the heart atria and ventricles to contract and pump blood
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Causes cells to die in the heart
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Assists in the circadian rhythm of the heart
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Causes heart defects
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Detailed explanation-1: -Like all muscle, the heart needs a source of energy and oxygen to function. The heart’s pumping action is regulated by an electrical conduction system that coordinates the contraction of the various chambers of the heart.
Detailed explanation-2: -In an adult, the sinus node sends out a regular electrical pulse 60 to 100 times per minute. This electrical pulse travels down through the conduction pathways and causes the heart’s lower chambers (ventricles) to contract and pump out blood.
Detailed explanation-3: -In 1893, Wilhelm His Jr. discovered the physical link that electrically bridges the atria and ventricles of the heart. [1] This specialized muscle bundle connecting the atrial and ventricular chambers of the heart is now known as the bundle of His.