The layer of a vessel wall composed mainly of simple squamous epithelium is the tunica ________.
Fill in the blank(s) with the appropriate word(s).
intima
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Which of the following is an effect of aging on the muscular system?
A) Tolerance for exercise increases. B) Skeletal muscles become more elastic. C) Skeletal muscle fibers become smaller in diameter. D) Muscle fibers contain more myoglobin. E) Scar tissue formation does not occur.
Which of the following types of force act parallel to a surface?
A. shear B. compression C. tension D. all of the above
What are active-transport mechanisms commonly called?
a. bridges b. pumps c. couriers d. funnels e. engines
Metabolically, cardiac muscle relies on
A. aerobic metabolism using glycolysis of glycogen to meet most ATP demands. B. anaerobic metabolism using myoglobin, creatin kinase, and ketone bodies. C. anaerobic metabolism using glycolytic enzymes to quickly generate ATP. D. aerobic metabolism using many mitochondria and a rich supply of myoglobin.