Exchange of dissolved substances between the blood and the interstitial fluid occurs by ________.
A. diffusion and active transport
B. filtration and active transport
C. diffusion and filtration
D. diffusion
Answer: D
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Suppose all synarthrotic joints were fused in an individual. Which of the following would be true of this individual?
A. Head-turning would be impossible because the atlas and axis would be fused. B. Braces would not work to straighten the person's teeth because their teeth would not move. C. The person would not be able to flex their fingers and grasp objects. D. The person would not be able to bend forward because their vertebral column would be fused.
The function of microvilli, often seen on the apical membrane of transporting epithelia, is to
A) increase the toughness of the cell. B) increase the movement of extracellular fluid. C) increase the cell's surface area. D) increase the resistance of the cell to viruses. E) allow the cell to move through a fluid medium.
Which of the following proteins attaches Z disks to myosin myofilaments?
A) nebulin B) titin C) actin D) both A and C
What special characteristic of the respiratory membrane facilitates gas exchange?
A. The large surface area of the combined alveoli facilitates gas exchange. B. Smooth muscles in the walls of the alveoli hold the alveoli open to increase lung volume and surface area. C. The presence of alveolar macrophages and mucus keep the alveoli clear and reduce membrane thickness. D. Cartilages in the walls of the alveoli hold the alveoli open to increase lung volume and surface area.