Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 34.3, Problem 2TC

How does contracting the diaphragm muscle and the intercostal muscles (which decreases their sizes) increase the volume of the chest cavity?

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When the inspiratory muscles contract, (a) only the lateral dimension of the thoracic cavity increases, (b) only the anteroposterior dimension of the thoracic cavity increases, (c) the volume of the thoracic cavity decreases, (d) both the lateral and the anteroposterior dimensions of the thoracic cavity increase, (e) the diaphragm bulges superiorly.
Why does the inspiratory muscles prevent the lungs from collapsing?
When the diaphragm contracts, it tenses and moves inferiorly, causing(a) an increase in the volume of the thoracic cavity. (b) a decrease in the volume of the thoracic cavity. (c) decreased pressure on the contents of the abdominopelvic cavity. (d) increased pressure in the thoracic cavity.

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Respiratory System; Author: Amoeba Sisters;https://www.youtube.com/watch?v=v_j-LD2YEqg;License: Standard youtube license