1. Tardigrade
  2. Question
  3. Biology
  4. Read the following statements: A. The action potential generated by the SA node stimulates both ventricles to undergo simultaneous contraction. B. The heart sound Lubb is associated with the closure of both semilunar valves. C. The QRS complex in ECG represents the depolarization of the ventricles. Select the appropriate option from the following:

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Q. Read the following statements:
$A.$ The action potential generated by the SA node stimulates both ventricles to undergo simultaneous contraction.
$B.$ The heart sound Lubb is associated with the closure of both semilunar valves.
$C.$ The QRS complex in ECG represents the depolarization of the ventricles.
Select the appropriate option from the following:

NTA AbhyasNTA Abhyas 2020Body Fluids and Circulation

Solution:

The action potential generated by SA node stimulates both atria to undergo simultaneous contraction called atrial systole. The first heart sound Lubb is associated with the closure of both atrioventricular valves.