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The fMRI scan shows a human brain.

Explain control of breathing rate by the structure labelled X.

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a	breathing centre in medulla (oblongata)/brain stem;
b	operates via autonomic nervous system;
c	blood pH reduced/more acidic (with increased carbon dioxide);
d	(Medulla) causes deeper/faster breathing;
e	expels more carbon dioxide from lungs/blood;
f	raises pH of blood;