Why is the heart strings made of same material as tendons?

The heart strings, or chordae tendineae, are made of collagen and elastin, similar to tendons, because they need to provide strong, flexible support to the heart valves. This material composition allows them to withstand the continuous mechanical stress of the heart's contractions while maintaining the necessary elasticity to adapt to the heart's changing shape. By having a similar structure to tendons, they ensure the proper functioning of the heart's valvular system, preventing backflow of blood.