I might be wrong in the answer but I believe you are refering to creatine. A substance secreted by the human body using the liver in conjuntion with the kidneys at a rate of 15 grams a day. We stop developing these amounts with age but now science have left us with plenty of suplements to provide this creatine need for muscle growth.
A muscle becomes shorter when it contracts.
When a muscle contracts, it shortens in length.
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
When a muscle contracts, it pulls with a force generated by the muscle fibers contracting and shortening.
When one muscle in a pair contracts the other expands.
shortens
Flexion
Flexion
The muscle that contracts when the leg is extended at the knee is call the gastrocnemius muscle
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.
When the bicep contracts the triceps relax
Relaxes