As a subject matter expert in the field of biochemistry, I can explain the roles of collagen and elastin in the human body.

Collagen and elastin are both types of proteins that are crucial for the structure and function of our connective tissues.
Collagen is the most abundant protein in the human body, making up about 25% to 35% of the whole body protein content. It is found in various tissues including skin, tendons, ligaments, and bones. The primary purpose of collagen is to provide strength and support to these tissues. It is particularly known for its role in wound healing and maintaining the integrity of various body parts.

Elastin, on the other hand, is a protein that is elastic and can be stretched. It is found in tissues that need to be flexible, such as skin, lungs, and arteries. Elastin's main function is to provide elasticity and to allow tissues to return to their original shape after being stretched or compressed. This property is vital for the proper functioning of organs and tissues that undergo repeated cycles of stretching and relaxation, such as the heart muscle and blood vessels.

In summary, while both collagen and elastin contribute to the structural integrity of tissues, collagen is more about providing strength and resistance to stretching, whereas elastin is about allowing flexibility and the ability to return to shape after deformation.

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Collagen is the primary component of the body's connective tissue. About 80% of the dermis -- the part of your skin that's under the epidermis (outer layer) -- is collagen. Collagen gives your skin strength. Elastin, as its name implies, enables your skin to stretch and bounce back; it is elastic.read more >>