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How much of the body is skeletal muscle?
40%
How much of the body is smooth/cardiac muscle?
10%
What is a bundle of muscle fibers called?
Muscle fasciculus ("little bundle")
What are the contractile subunits spanning the length of a muscle fiber called?
Myofibrils
How much of the length of a muscle do the fibers typically span?
The whole thing
What is the thin membrane enclosing a skeletal muscle fiber?
The sarcolemma
What are the two layers of the sarcolemma?
The true cell membrane (plasma membrane)
Outer polysaccharide coat with collagen fibrils
How much actin and myosin are in each myofibril?
1500 myosin filaments
3000 actin filaments
(Just remember 2x as much actin)
What are the bands that contain only actin called?
I bands (are light)
What is found in I bands?
Actin only
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