Which of the following is not a function of the respiratory system?
A
Vibration of the Vocal Cords
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B
Olfaction
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C
Exchange of Gases
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D
Natural pacemaker
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Solution
The correct option is D Natural pacemaker The heart's rhythm is controlled by a natural pacemaker (the sinus node) in the right upper chamber (atrium).
It is not the function of respiratory system.