Hormones having direct effect on blood pressure and sa node of heart
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The predominant route by which triiodothyronine (T3) affects cardiac action is by exerting a direct effect in cardiac myocytes through binding to thyroid hormone nuclear receptor isoforms. ... Thyroid hormone influences on heart rate are exerted by specific ion channel proteins in the sinus node of the left atrium.
Norepinephrine (noradrenaline) and epinephrine (adrenaline) activate the sympathetic nervous system and cause the heart rate to speed up. Acetylcholine stimulates the parasympathetic nervous system and lowers the heart rate. Thyroid hormones, which affect almost all cells in the body, increase the heart rate.
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The predominant route by which triiodothyronine (T3) affects cardiac action is by exerting a direct effect in cardiac myocytes through binding to thyroid hormone nuclear receptor isoforms. ... Thyroid hormone influences on heart rate are exerted by specific ion channel proteins in the sinus node of the left atrium.
Norepinephrine (noradrenaline) and epinephrine (adrenaline) activate the sympathetic nervous system and cause the heart rate to speed up. Acetylcholine stimulates the parasympathetic nervous system and lowers the heart rate. Thyroid hormones, which affect almost all cells in the body, increase the heart rate.
Hope that it will help u...!!:-)
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