Air rushes into the lungs of humans during inhalation because the volume of the

ID: 47699 • Letter: A

Question

Air rushes into the lungs of humans during inhalation because

the volume of the thoracic cavity increases

pressure in the alveoli increases

the diaphragm contracts and pushes upward on the chest cavity

smooth muscle lining the trachea and bronchi contracts and causes their volume to increase

the volume of the thoracic cavity increases

pressure in the alveoli increases

the diaphragm contracts and pushes upward on the chest cavity

smooth muscle lining the trachea and bronchi contracts and causes their volume to increase

The changes that occur during inhalation are as follows:

muscles attached to rib cage contract and increase chest cavity,

diaphragm contracts and moves downwards,

intercoastal muscles between ribs also increase chest cavity,

the pressure in lungs gets decreased.

Hence, the air rushes into lungs during inhalation because of increase in volume of thoracic cavity.

Thus, the correct option for the given question is first one.

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