Worksheet on Muscular system 1. What is the purpose of muscles to the human body? 2. What are the three types of muscles in the human body? 3. Describe how skeletal muscles work. Be sure to include the sliding filament model. 4. Why are skeletal muscles also called voluntary muscles? 5. Why are cardiac and smooth muscles called involuntary? 6. How do muscles work to create movement? 7. What contribution to homeostasis does this system make? 8. Explain how the heart muscle can continue to beat independently. 9. What regulates the contraction of smooth muscles in the body? 10.Does this system contribute to the maintenance of homeostasis in the body? if so how?