Some Events Related to Breathing 1 increased rate of breathing 2 Nervous stimulation of the diaphragm 3 Increased concentration of CO 2 in the blood 4 Decreased concentration of CO 2 in the blood 5 Chemical stimulation of the respiratory centre   The sequence of events that occurs as the breathing rate is increased Is   a) 3,5,2,1 and 4 b) 5,3,1,2 and 4 c) 3,2,4,1 abd 5 d) 4,3,5,2 and 1

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