Define these terms:

(a) negative pressure inhalation:
(b) positive pressure exhalation:


(a) negative pressure inhalation: Suction caused by the negative pressure created in the lungs by the contraction of the muscles of inspiration. The air flows because pressure is higher outside than inside the lungs.
(b) positive pressure exhalation: The size of the thorax and pleural sacs decreases, pressure in the lungs increases and air flows out of the body down its concentration gradient.

Biology & Microbiology

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