The neural system maintains and moderates the respiratory rhythm as per the demands of the body ...

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The neural system maintains and moderates the respiratory rhythm as per the demands of the body tissues. The rate and depth of breathing is controlled by group of neurons located in medulla oblangata and pons varolii. Thus, respiratory centres are called medullary and pons respiratory centres. \( W \) and \( \mathrm{X} \) are medullary respiratory centres which are located in dorsal and ventrolateral portion of medulla oblangata whereas Y and Z are pons respiratory centres located in dorsal and lower part of pons varolii.

Which respiratory centre can cause either inspiration or expiration?
(A) W
(B) \( X \)
(C) \( \mathrm{Y} \)
(D) Z
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