Muscle cell (myocyte, muscle fiber) anatomy:
Sarcoplasmic reticulum: specialized area of the endoplasmic reticulum
Surrounds the myofibrils like a web
At each end, forms bag-like structure “terminal cisternae”
Area where calcium (Ca2+) is stored
Transverse tubules: tube formation of the sarcolemma
Tubes run from the external surface straight through the muscle cell
Transverse tubules and terminal cisternae form a “triad” structure (many of these along the length of the muscle cell)
Muscle Physiology video
Muscle Physiology This video was made in Dr. O's A&P1 class. Make sure you answer & review the questions at the end of the video, and also the following question:
What are the functions and structure of skeletal, smooth & cardiac muscle?
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