muscle fibers contracting
The sarcomeres shortens when the muscle contract. By Adam Safi
shortens
Isotonically - The load your are lifting is equal to or less than the force generated by your muscle. Your muscle shortens when it contracts allowing you to lift the dumbbell.
myofibrils
When a muscle contracts, it shortens in length.
it shortens
It constricts it shortens
The Muscle tissue is the one to contract and shorten when it moves or stretches it pulls on the bone to create movement and it shortens and in some cases it contracts
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
during skeletal muscle contraction ,I band and H zone shortens. Sarcomeres
Essentially the second half of your question is what happens when a muscle contracts on a larger scale. On a much smaller scale, the contraction of muscle is caused by myosin proteins pulling themselves along the surface of an actin protein, which shortens the muscle. Muscles pull the bone that they are attached to at their point of insertion towards their point of origin.
No it is not true.