The airway that supplies one lobe of a lung is called a:
a. primary bronchus
b. secondary bronchus
c. tertiary bronchus
d. bronchiole
Answer: b. secondary bronchus
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An increase in plasma PO4 concentration forces a reduction in plasma Ca2+ as a result of the inverse relationship between plasma PO4 and Ca2+ levels
Indicate whether the statement is true or false
Engorgement of the erectile tissues of the clitoris and increased secretion of the greater vestibular glands involve neural activity that includes what?
a. somatic motor neurons b. parasympathetic activation c. sympathetic activation d. all of the above
Branched muscle fibers and intercalated discs are characteristic of ________ muscle tissue.
A. smooth B. multinucleated C. skeletal D. cardiac E. voluntary
What is the most likely reason humans have only two nipples?
A. Our primate ancestors probably had litters. B. The number of nipples was reduced in humans due to sexual selection. C. Primates generally have only one offspring. D. Most mammals have only two nipples. E. Having two nipples is associated with upright walking (bipedality).