Multiple Choice
Which of these is a career that specializes in the study and treatment of lung conditions?
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22. The Respiratory System
Introduction to Lung Physiology
Multiple Choice
What happens when your diaphragm relaxes and moves upward during the breathing process?
A
The volume of the thoracic cavity decreases, causing exhalation.
B
The pressure in the thoracic cavity increases, leading to inhalation.
C
The pressure in the thoracic cavity decreases, leading to inhalation.
D
The volume of the thoracic cavity increases, causing inhalation.
Verified step by step guidance1
Understand the role of the diaphragm in breathing: The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It plays a crucial role in the process of breathing by changing the volume of the thoracic cavity.
Identify the movement of the diaphragm during relaxation: When the diaphragm relaxes, it moves upward into the thoracic cavity, returning to its dome shape.
Analyze the effect of diaphragm relaxation on thoracic cavity volume: As the diaphragm moves upward, the volume of the thoracic cavity decreases because the space within the cavity is reduced.
Consider the relationship between volume and pressure in the thoracic cavity: According to Boyle's Law, when the volume of a closed space decreases, the pressure within that space increases.
Connect the changes in pressure to the breathing process: The increase in pressure within the thoracic cavity during diaphragm relaxation forces air out of the lungs, resulting in exhalation.
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