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Final exam section 1 1. The automatic tendency to maintain a relatively constant internal environment is called homeostasis. True False 2. The ATP/CP pathway is considered aerobic metabolism. 3. About 98% of the human body is composed of only six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorous. 4. Mitochondria are known as the powerhouse of the cell. 5. The heart, arteries, and veins are part of the circulatory system. True False 6. There are 80 bones in the axial skeleton. 7. The origin is the distal attachment of a muscle. 8. Type II muscle fibers are aerobic. 9. In a concentric contraction, the muscles shorten to produce movements. True False 10. An antagonist muscle is one that has an action directly opposite to that of the agonist. 11. Magnitude, direction, point of application, and line of action are the four components of force.