B. Choose and write the letter of the correct answer on the blank. 1. What connects a muscle to a bone? A. cartilage B. ligaments C. joint D. tendon 2. Which of the following bones protects the brain? A. backbone B. ribs C. hipbones D. skull 3. What type of bones protect the heart and lungs from injury? A. ribs and breastbone C. skull and breastbone B. ribs and collarbones D. shoulder blade and collarbones 4. What is the function of the axial skeleton? A. protects the delicate organs C. controls the action of smooth muscles B. helps in maintaining a proper posture D. provides support and aids the body in movement 5. What bone disease could be prevented if we exercise at least twice a week? A. bone cancer B. osteoporosis C. leukemia D. rickets

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