Question

The electrical activity of the cardiac cycle can be recorded in a graphical form by electrocardiogram or ECG.

Various phases of each cardiac cycle are represented by a letter from P to T.

P wave → excitation or depolarisation of atria
QRS complex → depolarisation of ventricles
T → repolarisation of ventricles (excited to normal)


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Answer 1

Explanation:

Electricity is the flow of electrical power or charge. It is a secondary energy source which means that we get it from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and other natural sources, which are called primary sources.

Answer 2

Answer:

The sinoatrial node is present at the right upper corner of the right atrium. The node is present below the Vena Cava. It initiates the autonomous contraction of the heart muscles.

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