What is the main process of exhalation?
Understand the Problem
The question is asking for the correct description of the main process of exhalation in the respiratory system. It involves understanding how the diaphragm functions and the direction of air movement during this process.
Answer
Exhalation involves the relaxation of the diaphragm, a decrease in thoracic cavity volume, and an increase in pressure, forcing air out of the lungs.
The main process of exhalation involves the relaxation of the diaphragm and chest muscles, leading to a decrease in thoracic cavity volume and an increase in pressure, which forces air out of the lungs.
Answer for screen readers
The main process of exhalation involves the relaxation of the diaphragm and chest muscles, leading to a decrease in thoracic cavity volume and an increase in pressure, which forces air out of the lungs.
More Information
Exhalation, also known as expiration, is usually a passive process when a person is not exercising due to the elastic recoil of the lungs and chest wall. However, it can become active during activities like singing or heavy exercise when additional muscle contraction helps force air out more quickly.
Tips
A common mistake is confusing the process of inhalation with exhalation. Remember that exhalation involves the relaxation, not contraction, of the diaphragm.
Sources
- MedlinePlus Medical Encyclopedia - medlineplus.gov
- Mechanics of Ventilation - SEER Training Modules - training.seer.cancer.gov
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