Key result
In day 11 embryonic chick heart ventricular myocytes, the sarcoplasmic reticulum is functional and contributes to Ca2+ transients, though most Ca2+ enters via sarcolemmal Ca2+ channels.
The study demonstrates that the sarcoplasmic reticulum is functional in the embryonic chick heart well before hatching, contributing to Ca2+ transients alongside sarcolemmal Ca2+ channels.
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Does not alter clinical practice; extends developmental research on cardiomyocyte Ca2+ handling in non-mammalian models.
Brotto et al. (1996) studied this question. Pharmacological agents (Isoproterenol, Nifedipine, Ryanodine) was evaluated on Ca2+ transients. In day 11 embryonic chick heart ventricular myocytes, the sarcoplasmic reticulum is functional and contributes to Ca2+ transients, though most Ca2+ enters via sarcolemmal Ca2+ channels.
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