Which statement is accurate about muscles?

The accurate statement about muscles is that they provide movement of body parts. Muscles play a fundamental role in the human body by enabling movement through contraction and relaxation. When muscles contract, they pull on bones, which are connected by tendons, facilitating movement at joints. This is essential for various activities, including walking, lifting, and even more complex actions like typing or playing sports.

The other statements do not accurately reflect the primary functions of muscles. While it is true that muscles work around joints and can contribute to preventing contractures under certain circumstances, the core function emphasized in the correct choice is movement. Furthermore, muscles do not provide toxins; instead, they might produce lactic acid as a byproduct during intense exercise, but this is not a function of providing toxins.