In the expiration condition,the diaphragm becomes

The diagram above shows which phenomenon of respiration?

During forced expiration,which muscles actively contract?

The most important function of the diaphragm in mammals is:

Hiccups can be best described as

Given below are events occurring during inspiration. Select the correct order of sequence from the options given below.
$(I)$ Air from atmosphere rushes into lungs.
$(II)$ Thoracic volume increases.
$(III)$ Intercostal muscles contract and ribs along with sternum move upward and outward.
$(IV)$ Diaphragm becomes flat and goes downwards.