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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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kmaster87 kmaster87
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12 years ago
Why is there a continuous inward-directed movement for oxygen in the lungs?
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12 years ago
During heavy breathing – active expiration – contract abdominal muscles (increase intra-abdominal pressure Rightwards Arrow pushes diaphragm up Rightwards Arrow increases intrathoracic pressure), internal intercostal muscles (pull ribs downward, inward) Rightwards Arrow lungs are emptied more forcefully. During forceful expiration, intrapleural pressure exceeds atmospheric pressure, but lungs don’t collapse because intra-alveolar pressure increases, too (4 mmHg pressure gradient stays same).

Enjoy the attachment, btw, what textbook is this question coming from? Thinking Face
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kmaster87 Author
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#2
12 years ago
marieb 8th edition
Why is there a continuous outward-directed movement for carbon dioxide in the lungs?
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