d. The Muscular System 7. Ruth is a 60-year old teacher. She complains painful joints. When she had her check-up, she was told by her doctor that the inflammation of her joints may be due to infection and mineral deficiency considering her age. What disease may Ruth be suffering from? a. arthritis c. osteoporosis b. fracture d. muscle strain 8. What type of muscles are stomach, intestines, urinary bladder, and other internal organs? a. smooth muscles c. skeletal muscles b. cardiac muscles d. neurotic muscles 9. Rhett Rey is an athlete. Sometimes he experiences strong muscle contractions in his legs causing tightening and pain in the area. Which of the following diseases may Rhett Rey be suffering from? a. cramps c. dislocation b. muscle strain d. muscle strain 10. What muscles are described as voluntary muscles because they can control their movement? a. skeletal muscles C. cardiac muscles b. smooth muscles d. neurotic muscles 11. What is the largest organ of the human body? a. skin c. heart b. liver d. brain 12. Which body system do nails belong? a. Skeletal System c. Integumentary System b. Muscular System d. Digestive System​