Class 11 Biology Body Fluids and Circulation Structure and function of heart

Easy

The first heart sound occurs at:

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A
Opening of semilunar valve
B
Closing of semilunar valve
C
Onset of auricular systole
D
Sudden closure of $A.V.$ valves

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Class 11 Questions

Class 11

Biology Questions

Chapter

Body Fluids and Circulation

Subtopic

Structure and function of heart

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