Surfactant is:
A) produced by the mucous cells of the left and right mainstem bronchi.
B) quickly destroyed in patients who have a severe upper airway obstruction.
C) a phospholipid compound that decreases surface tension on the alveolar walls.
D) a lubricating substance that increases alveolar surface tension during breathing.
Answer: C) a phospholipid compound that decreases surface tension on the alveolar walls.
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Which of the following accounts for almost two-thirds of the mass of bone tissue?
A) cells B) protein fibers C) calcium phosphate D) osteons E) polysaccharides
The greater the concentration of a solution, the greater the
A. osmotic pressure of the solution. B. tendency for water to diffuse from the solution. C. rate of facilitated diffusion. D. amount of solvent. E. number of carrier molecules present.
Which of the following is a hinge joint?
A) interphalangeal B) atlantoaxial C) radioulnar D) carpometacarpal
Acetylcholine (ACh) always has an excitatory effect.
Answer the following statement true (T) or false (F)