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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

Similar Questions

Air moves into the lungs when

What structures are responsible for the breathing process?

$I.$ Intra-pulmonary pressure remains less than the atmospheric pressure.
$II.$ There is negative pressure in the lungs compared to the atmospheric pressure.
In which of the above two situations does inspiration take place? Choose the correct option.

Expiration occurs due to

The normal shape of the diaphragm is

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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