Why does hair turn gray or white as people age?
A. Keratin production decreases.
B. Melanocytes die out.
C. The shaft becomes rounder in cross-section.
D. Mitosis slows down in the hair shaft.
E. Blood supply to the scalp diminishes.
Answer: B
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The sympathetic division of the ANS generally
A) is called the "fight or flight" division. B) increases alertness. C) prepares the body to deal with emergencies. D) stimulates tissue metabolism. E) All of the answers are correct.
The abnormal condition of air in the pleural cavity is known as:
a. pleurisy b. lung cancer c. pneumothorax d. pulmonary edema e. congestive failure
Which blood vessel drains the liver?
A. Hepatic vein B. Hepatic portal vein C. Hepatic artery
In a simple dominant-recessive inheritance pattern, what percentage of the offspring
would exhibit the dominant trait if one parent is heterozygous and the other is homozygous recessive? A) 25% B) 100% C) 50% D) 75%