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Tunnels dipping into the fibre so the signal reaches inside are called:

AV tubules
BL tubules
CX tubules
DT tubules
Answer & Solution
Correct answer: D. T tubules
1. The action potential must get deep inside. 2. The sarcolemma folds inward to carry it. 3. Those folds are T tubules. _Source: OpenStax Anatomy and Physiology 2e, Chapter 10, Muscle Tissue._
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