How does the respiratory system in humans maintain the balance of oxygen and carbon dioxide in the body?
A. Through the process of gas exchange in the lungs
B. By filtering the air through the kidneys
C. By absorbing oxygen through the skin
D. By converting carbon dioxide into oxygen
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Explain the role of diaphragm in the mechanism of breathing.
A. The diaphragm helps in digestion by secreting digestive enzymes
B. The diaphragm has no role in the mechanism of breathing
C. The diaphragm helps in the process of inhalation and exhalation by changing the volume of the chest cavity.
D. The diaphragm only helps in exhalation and not in inhalation
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