MCQ
$EC =$ ..........
- A$TV + IRV $
- ✓$TV + ERV$
- C$ERV + RV $
- D$TV + IRV$
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$(a)$ Contraction of diaphragm
$(b)$ Contraction of external inter-costal muscles
$(c)$ Pulmonary volume decreases
$(d)$ Intra pulmonary pressure increases