1.   But the domain may also have a role in helping to home in on the collagen fibers.

2.   Having collagen fibers arranged this way discourages bending and allows the erect penis to hold its shape.

3.   Their purpose is not known for sure but they may serve as claws to bring the collagen fiber to the active center.

4.   When you relax your knee, the collagen fibers crimp up again.

5.   With age, collagen fibers start to stick together like those strands of cold spaghetti.