Body Fluids and Circulation — BIOLOGY STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation3 Marks
Question
Why does atrial systole always precede ventricular systole?
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Answer
The cardiac impulse arises from the SA node located in the wall of the right atrium.
The impulse first spreads through the atrial musculature, causing the atrial systole.
Then it passes through AV node and AV bundle to the ventricles to initiate ventricular systole, before which the atrial systole is completed; hence atrial systole always precedes ventricular systole.
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