Which of these statements concerning ventilation is NOT correct?

waelhammad

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2022-10-19

During inspiration, the pressure in the alveoli is less than atmospheric pressure.
Contraction of the neck muscles decreases the volume of the thoracic cavity.
When the diaphragm contracts, thoracic cavity volume increases.
During quiet breathing, passive recoil of the lung and thoracic wall cause expiration.

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waelhammad

2022-10-19

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B: Deep inspiration is helped by contracting the neck muscles (scalene, sternocleidomastoid), but this increases, not decreases lung volume.

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