BiologyWhich of the following statements is correct?

Which of the following statements is correct?

  1. A

    Cardiac output of an athlete will be much higher than that of an ordinary man.

  2. B

    P-wave of ECG represents the electrical excitation of the ventricles.

  3. C

    High blood pressure leads to heart diseases but never affects brain.

  4. D

    Heart failure is an alternate name of cardiac arrest.

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    Solution:

    P-wave of ECG represents the electrical excitation (or depolarisation) of the atria.

    High blood pressure leads to heart diseases and also affects vital organs like brain and kidney.

    Heart failure means the state of heart when it is not pumping blood effectively enough to meet the needs of the body. Cardiac arrest is the state when the heart stops beating.

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