MEDICAL
LUNGS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The diaphragm relaxes
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pressure in the lungs increases
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The ribs are elevated
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The size of the thoracic cavity decreases
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Detailed explanation-1: -This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
Detailed explanation-2: -During inspiration the diaphragm and the external intercostal muscles contract, causing an increase in the thoracic cavity volume. The contraction of the diaphragm accounts for approximately 75% of the air movement during normal breathing.
Detailed explanation-3: -During inspiration, the diaphragm and external intercostal muscles contract, causing the rib cage to expand and move outward, and expanding the thoracic cavity and lung volume. This creates a lower pressure within the lung than that of the atmosphere, causing air to be drawn into the lungs.