Answer:
T-tubules (transverse tubules)
Explanation:
T-tubules, also known as transverse tubules, are narrow tubes that are continuous with the sarcolemma (i.e., the cell membrane of striated muscle cells). In skeletal/cardiac muscle cells, T-tubules form invaginations of the sarcolemma that contain many ion channels involved in excitation-contraction (e-c) coupling of muscle cells. Thus, transverse tubules function to conduct the action potential from the cell membrane (sarcolemma) to the interior of the muscle cell.
Answer: The role an organism plays in its community is its niche. I Know this is right cause I took this test last year in 11 grade.
The answer to this would be D.) <span>If the Inquisition had access to black holes, this, instead of the rack, would surely have become the stretching device of choice.</span>