Select the correct statement.

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Question

(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

State the sequence of events for inspiration (breathing in).
$I$ - Increase in lung volume
$II$ - Decrease in intrapulmonary pressure
$III$ - Contraction of respiratory muscles
$IV$ - Increase in thoracic volume
$V$ - Air rushes into the lungs

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

Which muscles undergo contraction during normal expiration?

Which muscles help us to increase the strength of inspiration and expiration?

State whether the given statements are true or false.
$I.$ Ventilation in humans is an active process.
$II.$ Diaphragm helps in generating the pressure gradient in the lungs.
Choose the correct option.

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