Write about the Regulation of Cardiac Activity
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(1) Normal activities of the heart are auto regulated. The specialized muscles help in this regulation.
(2) The heart is said to be myogenic due to this abiltty
(3) In the medulla oblongata of brain, there is cardiovascular centre,
(4) From this centre sympathetic and parasympathetic nerves innervate the sinoatrial node.
(5) Sympathetic nerves secrete adrenaline and it stimulates and increases the heartbeat.
(6) Parasympathetic nerves secrete acetylcholine and it decreases the heart rate.
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