Class 9 Biology e-Book's MCQs - Complete
Download Pulmonary and Systemic Circulation App Quiz & e-Book PDF - 408
Apps:
MCQ 408:
The time for atrial systole in one heartbeat is
- 0.7 seconds
- 0.1 seconds
- 0.3 seconds
- 0.4 seconds
b
Class 9 Biology App & e-Book Tests PDF Download
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