What is collagen's primary function in connective tissues?

Collagen's primary function in connective tissues is to provide structural strength. Collagen is a protein that forms the main structural component of various connective tissues, including tendons, ligaments, and cartilage. It has a high tensile strength, allowing it to withstand stretching and pressure while maintaining the integrity of tissues. This structural support is crucial for the overall stability and function of many organs and systems in the body.

The other choices do not accurately describe the primary role of collagen. While elasticity is a property of some connective tissues, it is primarily provided by other proteins such as elastin. Collagen does not create a flexible network for muscle contraction; instead, it primarily provides strength and support. It also does not serve as an energy storage protein, which is typically the role of fats and certain types of carbohydrates. Thus, the choice that identifies collagen's role as providing structural strength is the most accurate representation of its function.