The T-tubules in the heart form diads rather than the triads found in skeletal muscles.

Name: The T-tubules in the heart form diads rather than the triads found in skeletal muscles.
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Unlike skeletal muscles, the T-tubules in the heart form diads (paired T-tubules with a single terminal cisterna) instead of triads (paired T-tubules with two terminal cisternae) in order to ensure efficient calcium release during excitation-contraction coupling.

The T-Tubules in the Heart Form Diads Rather Than the Triads