Vigorous Exercise, Carbon dioxide concentration in blood increases, Blood pH decreases, Drop in blood pH detected by chemoreceptors in Medulla, Carotid and Aotic bodies, Nerve impulses sent to Cardiovascular centre in Medulla, More nerve impulses sent via sympathetic nerve and less impulses sent via Vagus nerve to SA node, SA node becomes more active, more nerve impuses sent to atrial muscles and AV node, Heart muscles contact faster and stronger , Cardiac output increased.

Effect of exercise on Cardiac output

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