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

Difficult

What causes the first heart sound?

A
Lubb at the end of atrial systole
B
Dubb at the end of atrial systole
C
Lubb at the beginning of ventricular systole
D
Dubb at the beginning of ventricular systole

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Class 11 Questions

Class 11

Biology Questions

Chapter

Body Fluids and Circulations

Subtopic

Structure and function of heart

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Which of the following options contains the correct statements?

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