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NEET · Biology · STD 11 - 15. Body fluids and criculations
The diagram given here is the standard \(ECG\) of a normal person. The Pwave represents the
- A contraction of both ventricles
- B end of ventricular contraction
- C contraction of both the atria
- D initiation of the ventricular contraction.
Answer & Solution
Correct Answer
(C) contraction of both the atria
Step-by-step Solution
Detailed explanation
(c) : In the given diagram the \(P\)-wave represents the electrical excitation (or depolarisation) ofthe atria, which leads to the contraction of both the atria. The \(QRS\) complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after \(Q\) and marks the beginning of the systole. The \(T\)-wave represents the return of the ventricles from excited to normal state (repolarisation). The end of the \(T\)-wave marks the end of systole.
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