When muscles of diaphragm contract it becomes:
Correct answer: B. Less dome like
- A. More dome like
- B. Less dome like
- C. Less flat
- D. Convex
Explanation
When the muscles of the diaphragm contract, it becomes less domed and more flattened. The diaphragm is the primary muscle involved in the process of breathing. When it contracts, it moves downward and flattens out. This action increases the volume of the thoracic cavity, creating a decrease in pressure within the chest. As a result, air flows into the lungs to equalize the pressure and fill the expanded space. This is an inhalation or inspiration.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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