The mammalian lung is made air tight by the

Assessment: JAMB UTME - Biology - 2005 Subject: Biology

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The mammalian lung is made air tight by the
Answer Details
The mammalian lung is made air tight by the pleural membrane. The pleural membrane is a thin, double-layered membrane that covers the lungs and lines the inside of the chest cavity. It creates a sealed, air-tight space around the lungs called the pleural cavity, which helps to maintain the pressure gradient necessary for breathing. The pleural membrane also produces a lubricating fluid that reduces friction and allows the lungs to expand and contract smoothly during breathing. Therefore, it is the pleural membrane that makes the mammalian lung air tight.
Read lesson note on Respiratory System (WAEC)
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