Transverse tubules are a common feature in large mammalian atrial myocytes including human.

Abstract

Transverse (t) tubules are surface membrane invaginations that are present in all mammalian cardiac ventricular cells. The apposition of L-type Ca(2+) channels on t tubules with the sarcoplasmic reticulum (SR) constitutes a "calcium release unit" and allows close coupling of excitation to the rise in systolic Ca(2+). T tubules are virtually absent in the… (More)
DOI: 10.1152/ajpheart.00284.2011

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