Study fgures as you read the text
Select pieces oF art provide more visual content and oFten have
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Functions, and processes.
Part of a skeletal
muscle fiber (cell)
of the SR (2)
Relationship of the
sarcoplasmic reticulum and T tubules to
myoﬁbrils of skeletal muscle.
of the SR (blue) encircle each myoﬁbril like a
“holey” sleeve. These tubules fuse to form a
net of communicating channels at the level
of the H zone and saclike elements called
terminal cisterns abutting the A-I junctions.
The T tubules (gray) are inward invaginations
of the sarcolemma that run deep into the cell
between the terminal cisterns. (See detailed
view in Figure 9.11, pp.290-291) Sites of close
contact of these three elements (terminal
cistern, T tubule, and terminal cistern) are
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