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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

Vedclass · Accepted Answer

$I -$ 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.

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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.