Their lungs are designed to collapse progressively with increased hydrostatic pressure at depth so that air is forced out of the alveoli (air sacs) and into the upper part of the respiratory system.
(Their lungs; are designed; to collapse progressively with increased hydrostatic pressure at depth so that air is forced out of the alveoli (air sacs) and into the upper part of the respiratory system) (Their lungs; to collapse progressively; ) (air; is forced; out of the alveoli (air sacs) and into the upper part of the respiratory system)
Their lungs Their lungs air
are designed to collapse progressively is forced
to collapse progressively with increased hydrostatic pressure at depth so that air is forced out of the alveoli (air sacs) and into the upper part of the respiratory system
out of the alveoli (air sacs) and into the upper part of the respiratory system