Final answer:
Cardiomyocytes possess autoexcitability and autorhythmicity, but they do not secrete hormones.
Explanation:
Autoexcitability is a property of cardiomyocytes where they can produce electrical impulses without external stimulation. Autorhythmicity is another unique property of cardiomyocytes, allowing them to initiate an electrical potential at a fixed rate. Secretion of hormones is not a property of cardiomyocytes; instead, they play a role in contraction and not hormone secretion.
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