The centre controlling the heart rate is present in medulla oblongata of brain and possess chemoreceptors sensitive for 
and blood pressure. Heart rate is affected by several factors. These factors include all, except
ions in heart muscles
ions in blood
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Hormones from adrenal medulla, i.e. adrenaline and nor-adrenaline accelerates the heartbeat. The latter under normal conditions and the former at the time of emergency. Thyroxine hormone also increases the heart beat by increasing energy production. Oxytocin is a natural hormone that stimulates uterine contraction in childbirth and lactation after childbirth. It has no direct role in heartbeat. Rest all other options can also affect the heart rate in various ways.
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