muscle contains an oxygen-binding substance called
Also contain an oxygen binding protein called myoglobin, which increases rate of oxygen diffusion into the fiber. This protein gives the fibers a red color and therefore these fibers are also called red muscle fibers.ttached to the bone and moves them by contraction. The contraction is initiated by neural impulses and is under voluntary control. Structure. A muscle consists of a number of muscle fibers bound together by connective tissue and it is attached to a bone by collagen bundles called tendons.