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Q: Where is the M line of a skeletal muscle fiber?
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Describe which bands and zones of a sarcomere stay the same and which narrow or disappear during muscle contraction?

M line


What type of fiber begins with m?

MOYTA


If line m is perpendicular to line n and line n is perpendicular to line r how is line m relatred to line r?

Lines r and m are parallel or line r is line m continued


How are the skeletal and the muscular systems different?

The skeletal system is made up of Bone's. the muscular system is m ade up of muscles


How many fiber optic meters in a kilometer?

There are 1000 m of fiber optic [cable] in 1 kilometer.


what- line m is perpendicular to line L, line n is perpendicular to line m.?

Line L is parallel to line n.


What is the change in appperence of a myofibril during contraction with the I band?

In skeletal muscle contraction, the thin filaments of the sarcomere slide toward the M line, in between the thick filaments. This is called the sliding filament theory. The width of the A zone stays the same, but the Z lines move closer together. As the sarcomeres shorten and appear closer together, the muscle pulls together, producing tension that moves whatever it is attached to.Contraction is an active process; relaxation and return to resting length is entirely passive.


Helps you do work that starts with M?

Muscle


Are sarcomere thick filaments linked laterally by proteins of the Z line?

No, the M line