Which event occurs in response to an increase in thoracic volume?
A)The respiratory control center is activated.
B)Air moves into and through the respiratory passages.
C)Intrapleural pressure becomes greater than intrapulmonic pressure.
D)Air is exhaled.

Question

Quizplus · Accepted Answer

An increase in thoracic volume causes a decrease in intrathoracic pressure, which leads to air moving into and through the respiratory passages to equalize the pressure. This is inhalation, which is the only event listed that matches this description. The respiratory control center (A) is activated by changes in blood chemistry and does not directly respond to changes in volume. Intrapleural pressure typically remains negative (lower than atmospheric pressure) throughout the respiratory cycle (C), and air is not exhaled (D) during the initial response to an increase in volume.

Which Event Occurs in Response to an Increase in Thoracic