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(B) $1$. Breathing (ventilation) involves inhalation,which is an active process requiring the contraction of the diaphragm and external intercostal mu

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$I -$ True,$II -$ True

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(B) $1$. Breathing (ventilation) involves inhalation,which is an active process requiring the contraction of the diaphragm and external intercostal muscles. Although exhalation is generally a passive process under normal conditions,the overall process of ventilation is considered active because it requires energy expenditure for the inhalation phase.$2$. The contraction of the diaphragm muscle pulls the diaphragm downwards,which increases the anteroposterior volume of the thoracic cavity. This increase in volume leads to a decrease in intrapulmonary pressure compared to atmospheric pressure,thereby generating the pressure gradient necessary for air to flow into the lungs.

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.

Similar Questions

What happens when the pressure within the pulmonary cavity is higher than the atmospheric pressure?

Exhalation is the process of expulsion of air through the respiratory tract. Which of the following figures illustrates the process of exhalation?

Due to the presence of which structure is the pulmonary ventilation system in humans better developed than in reptiles and birds?

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.

An increase in pulmonary volume decreases the intra-pulmonary pressure to less than the atmospheric pressure,which forces the air from outside to move into the lungs. This process is known as:

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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.