What keeps the visceral pleura in close proximity to the parietal pleura?
A) positive pressure in the intrapleural space
B) surface tension of the intrapleural fluid
C) the mesothelia are one and the same
D) trans-alveolar pressure
E) spider web-like processes extending from the outer covering
Answer: B) surface tension of the intrapleural fluid
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A. require high concentrations of H2S gas for growth B. grow only in environments of reduced atmospheric pressure, such as found at high elevation C. grow at pressures exceeding 100 atm D. tolerate high concentration of barium
The toxin of Vibrio cholerae causes profuse diarrhea because it _____
A) modifies a G protein involved in regulating salt and water secretion B) binds with adenylyl cyclase and triggers the formation of cAMP C) signals IP3 to act as a second messenger for the release of calcium D) modifies calmodulin and activates a cascade of protein kinases
Members of the subphylum ____ were among the first animals to colonize terrestrial habitats and are
mostly insects.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
Which of the following best illustrates an instinctive behavior in cats?
a. scratching at the door to get in or out b. hunting and killing c. knowing when it is time to get fed d. being afraid of dogs e. All of the above are instinctive behaviors in cats.