Answer:
The action potential is conducted into a skeletal muscle fiber by, transverse tubules.
Hai! I can't really see it clearly but A would match with R.
is there any way u could retake the picturee?
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The answer to this question is the sacrum. The sacrum is a triangular bone that forms the base of the spinal column. This bone has a vital role in the skeletal system and also supports the weight of the upper body of a person and this bone and many nerves are inside the sacrum.
