Select the correct statement.

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(B) The process of breathing involves two main phases: inspiration and expiration.$1$. Inspiration occurs when the intrapulmonary pressure is less tha

Vedclass · Accepted Answer

Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

Vedclass · Answer

(B) The process of breathing involves two main phases: inspiration and expiration.$1$. Inspiration occurs when the intrapulmonary pressure is less than the atmospheric pressure,creating a negative pressure in the lungs with respect to the atmosphere,which forces air into the lungs.$2$. Expiration takes place when the intrapulmonary pressure is higher than the atmospheric pressure.$3$. During inspiration,the diaphragm and external intercostal muscles contract,increasing the volume of the thoracic cavity.$4$. During expiration,the diaphragm and external intercostal muscles relax,decreasing the thoracic volume and increasing intrapulmonary pressure,which pushes air out.Therefore,option $B$ is the correct statement.

Similar Questions

Which muscles are involved during forced breathing?

Select the correct process that occurs during inspiration (inhalation):
$(a)$ Contraction of the diaphragm
$(b)$ Contraction of external intercostal muscles
$(c)$ Decrease in pulmonary volume
$(d)$ Increase in intra-pulmonary pressure

In rabbits,inspiration occurs by the contraction of:

Arrange the given steps of expiration in the sequence of events occurring first:
$I.$ Relaxation of the diaphragm and sternum
$II.$ Reduction of the pulmonary volume
$III.$ Expulsion of air from the lungs
$IV.$ Increase in intra-pulmonary pressure
Choose the correct option.

During expiration,the diaphragm becomes

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