Histological Perspective
Both ends of the muscle are pulled together. This is because each muscle fiber is divided into contractile units called sarcomeres. Each sarcomere is composed of layers of thin and thick filaments, Actin and Myosinrespectively. The thick filaments, myosin, are located in the center of the sarcomere, a region called the A-Band. On either side of each A-Band, is a region called the I-Band. The I-Band is primarily composed of the thin filaments (Actin), although the thin filaments do overlap with the thick filaments within a sub region of the A-band called the zone of overlap.
As the muscle contracts the thick filaments pull the thin filaments together on either side, resulting in the apparent contraction of the muscle on both sides.
Gross Anatomical Perspective.
However, because a muscle is anchored at the origin of the stationary bone while its other end attaches at the insertion of the articulating bone and the net force of the contracting muscle pulls the insertion of the muscle to its origin.
It follows that: The correct answer is toward the origin.
Insertion point, which most probably is a tendon.
origin
ligament
uranus
When the muscle contracts, the tendon pulls on the bone to create movement. The tendon is the connective tissue that attaches the muscle to the bone, so when the muscle contracts, it exerts force on the tendon, which in turn moves the bone.
The muscle in your arm contracts. The muscle on the other side of your arm, opposite from the side that you are flexing, stretches.
The insert
A muscle becomes shorter when it contracts.
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.
When a muscle contracts, it shortens in length.
they dont u retard
A muscle that contracts shortens whereas a muscle that relaxes lengthens.