Chapter 32

Bone functions in ______. a. mineral storage b. movement c. blood cell formation d. all of the above

The ______ is the basic unit of contraction. a. osteoblast b. sarcomere c. muscle fiber d. myosin filament

ATP for muscle contraction can be formed by _______. a. aerobic respiration b. glycolysis c. creatine phosphate breakdown d. all of the above

Bones move when ______ muscles contract. a. cardiac b. skeletal c. smooth d. all of the above

A part of the ______ molecule can bind and break down ATP to release energy. a. actin b. myosin c. both d. neither

A sarcomere shortens when ______. a. thick filaments shorten b. thin filaments shorten c. both thick and thin filaments shorten d. none of the above

Match the words with their defining feature. ______osteoblast ______muscle twitch ______muscle tension ______joint ______myosin ______marrow ______metacarpals ______myofibrils ______muscle fatigue a. actin's partner b. all in the hands c. blood cell production d. decline in tension e. bone-forming cell f. motor unit response g. force exerted by cross-bridges h. area of contact between bones i. muscle fiber's threadlike parts