The mucus that traps dust particles in the lungs is produced by
A) epithelial tissue.
B) adipose tissue.
C) endocrine glands.
D) connective tissue.
E) muscle tissue.
A
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The central canal of bones contains ____ and _____ _____ that supply the osteocytes within the lucunae
Fill in the blank(s) with the appropriate word(s).
Lungfishes are classified as
A) lobe-finned fishes. B) cartilaginous fishes. C) ray-finned fishes. D) amphibians. E) jawless fishes.
Bile is produced by the liver and stored in the gallbladder. The function of bile is to
A) prevent regurgitation of food into the esophagus and activate stomach acids. B) lower the pH of the stomach. C) dissolve salts and detoxify poisons in food. D) raise the pH of chyme as it enters the small intestine. E) disperse fats into smaller particles.
In the near future, the human population is predicted to involve
A. a worldwide decrease in population growth due to limited resources. B. a continuation of human population growth at the same pace as in the previous century. C. a decrease in growth in most, but not all, more-developed countries and continued growth in most less-developed countries. D. an increase in population growth in all countries in the world.