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What is the primary function of the muscular system?

  1. Controlling and coordinating body systems

  2. Circulating blood through the body

  3. Covering, shaping, and holding the skeletal system in place

  4. Protecting the body from disease

The correct answer is: Covering, shaping, and holding the skeletal system in place

The primary function of the muscular system is to cover, shape, and hold the skeletal system in place. Muscles work together with bones to provide movement and maintain proper posture. Option A is incorrect because the nervous system is responsible for controlling and coordinating body systems. Option B is incorrect because the circulatory system, specifically the heart, is responsible for circulating blood throughout the body. Option D is incorrect because the immune system is responsible for protecting the body from disease. The muscular system does play a role in immunity by helping to move bacteria and other pathogens out of the body, but it is not the primary function.