During quiet breathing, the diaphragm and external intercostals muscles contract. What effect does this have on the thoracic cavity?

a. it increase the pressure and decreases the volume of the thoracic cavity
b. it increases the volume and decreases the pressure of the thoracic cavity
c. it increases the volume and increases the pressure of the thoracic cavity
d. it decreases the volume and decreases the pressure of the thoracic cavity


Answer: b. it increases the volume and decreases the pressure of the thoracic cavity

Anatomy & Physiology

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