28. The layer of the epidermis where the cells are considered protective but nonviable.      

31. The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment.

38. All of the bones of the skull, except the mandible, are united by sutures and are therefore immovable.

13. Yellow bone marrow contains a large percentage of ________.        

30. Fractures are repaired in four steps. Which of the  following explains those steps in the chronological order?        

31. How many types of bones are there in the human body?        

27. Which of the following is NOT a primary function of the skeletal system?        

37. Skeletal muscles relax when intracellular Ca2+ levels drop but may not cease contractions.

25. Both actin and myosin are found in the ________.        

12. The structure of bone tissue suits the function. Which of the following bone tissues is adapted to support weight and withstand torsion stresses?