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(B) Inspiration is the process by which atmospheric air is drawn in. $(1)$ During inspiration,the diaphragm contracts,which increases the thoracic vol

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$(a)$ and $(b)$

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(B) Inspiration is the process by which atmospheric air is drawn in. $(1)$ During inspiration,the diaphragm contracts,which increases the thoracic volume in the antero-posterior axis. $(2)$ The external inter-costal muscles contract,lifting up the ribs and the sternum,which increases the thoracic volume in the dorso-ventral axis. $(3)$ An increase in thoracic volume leads to an increase in pulmonary volume. $(4)$ According to Boyle's Law,an increase in pulmonary volume causes a decrease in intra-pulmonary pressure to less than atmospheric pressure,forcing air from outside into the lungs. Therefore,events $(a)$ and $(b)$ are correct.

Select the correct events that occur during inspiration.
$(a)$ Contraction of diaphragm
$(b)$ Contraction of external inter-costal muscles
$(c)$ Pulmonary volume decreases
$(d)$ Intra pulmonary pressure increases

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Select the correct events that occur during inspiration.$(a)$ Contraction of diaphragm$(b)$ Contraction of external inter-costal muscles$(c)$ Pulmonary volume decreases$(d)$ Intra pulmonary pressure increases