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

Medium

The opening of the pulmonary vein is without a valve because

A
It is a very small aperture
B
It has low blood pressure
C
Its opening is oblique
D
None of these

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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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