Slv it que

Dear student, option (a) is correct as the atrial systole occurs during the ventricular diastole. Option (b) is incorrect, the lub sound is produced in the heart due to closure of the auriculo ventricular valves . The lub sound is produced first which is followed by the dub sound. The gap between the these two sounds is of 0.3 seconds. Option (c) and (d) are correct as the joint diastole starts with the end of ventricular systole and ends with the end of ventricular diastole. Regards