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6. Which of the following protect the heart and lungs from injury?
A. Skull and breast bone
C. ribs and collarbones
B. Shoulder blade and collarbones
D. ribs and breastbones
7. Which of the following is a skeletal muscle? A. Muscle of the diaphragm
C. muscle of the stomach
B. Muscle of the lungs D. muscle of the thigh 3. How does a muscle pull a bone? A. The muscle expands. C. The muscle twists. B. The muscle contracts. D. The muscle flattens out. 9. Which of these organs has voluntary muscles? A. Arms C. heart B. Esophagus D. stomach 10. What happened to the muscles when they are not often used? They become A. toned. C. weak. B. strong. D. big. 41. Which type of muscle is involved in the beating of the heart? A. Cardiac muscles C. skeletal muscles B. Smooth muscles D. all muscles 12. Which activity is made possible by smooth muscles? A. blinking C. running B. digesting D. writing 23. Which of the following is NOT part of the skeletal system? A. Skull B. ribs C. biceps D. spine

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6 Which Of The Following Protect The Heart And Lungs From Injury A Skull And Breast Bone C Ribs And Collarbones B Shoulder Blade And Collarbones D Ribs And Brea class=

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Answer:

6. D

7. D

8. B

9. A

10. C

11. A

12. B

13. C

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