Hiccup occurs due to

Choose the correct option:
$(1)$ The volume of gases involved in breathing movements is measured by $Sphygmomanometer / Spirometer$.
$(2)$ Inspiration is initiated by the $relaxation / contraction$ of the diaphragm.

What is the most important function of the diaphragm in mammals?

The contraction of the diaphragm increases the volume of the thoracic cavity in which axis?

Additional muscles in the ...... impact the ability of humans to increase the strength of inspiration and expiration. Complete the given $NCERT$ statement with an appropriate option.

When do inspiration and expiration take place?