What cells within the alveoli are capable of phagocytosis and can therefore engulf particulate matter that might reach the alveoli?
a. alveolar macrophage
b. alveolar septal cells
c. alveolar NK cells
d. alveolar plasma cells
Ans: a. alveolar macrophage
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Sweating
a. causes vasodilation of the skin vessels. b. increases the insulative capacity of the skin so that less heat can be gained from the environment. c. is the only heat-loss mechanism available to the body when the environmental temperature is so high that a normal temperature gradient between the skin and the environment cannot be established. d. both (a) and (c) above. e. all of these answers.
Which type of epithelium constructs the thin walls of the air sac in the lungs?
A) simple squamous epithelium B) simple cuboidal epithelium C) simple columnar epithelium D) None of the listed responses is correct.
Phospholipids are important components of the plasma membrane. What does "C" represent on the diagram?
A. Polar (hydrophilic) region B. Nitrogen C. Nonpolar (hydrophobic) region D. Phosphorus E. Oxygen
What are the most commonly used medications for osteoporosis?
A. Progestins B. Bisphosphonates C. Calmodulins D. Synthetic thyroid hormones