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do thyroid hormones influence heart rate from influencing the heart itself, or the attached to it?

Sagot :

Answer:

An excess of thyroid hormones increases cardiac contractility and resting heart rate (see box below). Cardiac output may increase by 50-300 per cent as a result of the combined effect of increases in resting heart rate, contractility, ejection fraction and blood volume, with a concomitant decrease in SVR.