The mammalian heart is myogenic and it is regulated by nerves. The hea

The mammalian heart is myogenic and it is regulated by nerves. The heartbeat originates from

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sinoatrial node

QRS wave

T wave

hepatic portal system

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UPSC CDS-1 – 2017

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The heartbeat originates from the sinoatrial node.

The sinoatrial (SA) node is a specialized group of cells located in the wall of the right atrium of the heart. It is the natural pacemaker of the heart, generating electrical impulses that initiate each heartbeat. The mammalian heart’s ability to generate its own impulse is referred to as its myogenic nature.

The SA node impulse spreads through the atria, causing them to contract, and then reaches the atrioventricular (AV) node, which conducts the impulse to the ventricles. The QRS wave and T wave are graphical representations of electrical activity in the ventricles during an electrocardiogram (ECG). The hepatic portal system is part of the circulatory system involved in blood transport from the digestive organs to the liver.

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