When you flex or use a muscle, the muscle fibers relax blood flow decreases muscle fibers slide apart myofibrils slide together?

When you flex or use a muscle, the myofibrils slide together. Myofibrils refers to any of the elongated contractile threads that is seen in striated muscle cells. When we stretch our muscle or use it in doing some exercises, our myofibrils are at the same time sliding.

Your answer would be false