This theory is a possible cause of the increasing stiffness of muscles,such as the heart walls,with increasing age.

Question

Quizplus · Accepted Answer

Cross-linking refers to the formation of chemical bonds between proteins and other molecules, which can cause stiffness and decreased flexibility in tissues. This process is known to increase with age and could be a possible cause of the increasing stiffness of muscles, including the heart walls. The other choices (Hayflick limit, free radicals, and cholesterol buildup) do not directly relate to cross-linking and its effects on muscle stiffness.

This Theory Is a Possible Cause of the Increasing Stiffness