A motor unit is a ____
a. single muscle fiber activated individually
b. complete set of muscle fibers in a single muscle
c. single sarcomere
d. sequence of muscle fibers activated in order
e. group of muscle fibers activated as a block
ANSWER: e
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What is the main reason that a person sitting on the beach with an air temperature of 15 °C loses heat less rapidly than when immersed in lake water at 15 °C?
A) Water conducts heat more efficiently than air does. B) Water evaporates, and heat is lost to evaporation. C) Metabolic heat production is greater in air than in water. D) Air is a poor insulator.
Salivary amylase begins the digestion of which class of foods in the mouth?
a. starch b. proteins c. lipids d. amino acids e. nucleic acids
Compared to mammals and reptiles, what characteristic prevents amphibians from surviving far from water?
A. Their limbs are too weak to support their weight on land. B. Their cartilaginous endoskeleton would dry out on land. C. They do not have any lungs and cannot breathe out of the water. D. Their eggs do not have an amnion to prevent them from drying out.
The principal government agency responsible for tracking infectious diseases in the United States is the
A. United States Department of Agriculture. B. World Health Organization. C. National Institutes of Health. D. Infection Control Committee. E. Centers for Disease Control and Prevention.