Question
The first heart sound is
'Lubb' sound at the end of systole
'Dub' sound at the end of systole
'Lubb' sound at the beginning of systole
'Dub' sound at the beginning of systole
'Lubb' sound at the end of systole
'Dub' sound at the end of systole
'Lubb' sound at the beginning of systole
'Dub' sound at the beginning of systole
The correct answer is: 'Lubb' sound at the beginning of systole
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according to reaction,
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?
