According to Laplace's law, the air pressure necessary to prevent the collapse of an alveolus is directly proportional to the surface tension and inversely proportional to the alveolus's radius. Therefore, as an alveolus gets __________ during __________, there is an increased need for the actions of surfactant to prevent alveolar collapse.
A. larger; expiration
B. larger; inspiration
C. smaller; expiration
D. smaller; inhalation
Answer: C. smaller; expiration
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Which of the following is a potential substrate a cell can use to produce ATP?
a. its own intracellular nutrient stores b. nutrients stored in other, specialized storage cells c. recently ingested (and digested) food d. all of these e. none of these
A muscle producing almost peak tension during rapid cycles of contraction and relaxation is said to be in
A) incomplete tetanus. B) complete tetanus. C) treppe. D) wave summation. E) recruitment.
The fuzzy coat made of glycoproteins and glycolipids found on the external surface of the plasma membrane is called the _______________
Fill in the blank with correct word.
The ability of some cardiac muscle cells to initiate their own depolarization and cause depolarization of the rest of the heart is called
a. absolute refractory period. b. fibrillation. c. a functional syncytium. d. an action potential. e. automaticity.