The greater the lipid solubility of a substance, the slower the substance can diffuse through the membrane's lipid bilayer down its concentration gradient
a. True
b. False
Indicate whether the statement is true or false
False
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Gallstones are usually composed of
A. uric acid. B. cholesterol. C. calcium salts. D. bile pigments.
Describe the ways that proteins of the plasma membrane allow a cell to control its internal environment or interact with its external environment
Which of the following statements concerning the length-tension relationship of skeletal muscle is incorrect?
a. when a muscle is maximally stretched, it can develop the most tension upon contraction because the thin filaments can slide in a maximal distance. b. maximum tension can be developed if the muscle is at its lowest at the onset of contraction. c. in the body, the relaxed length of muscle is at its optimal length. d. when the initial length of muscle prior to contraction becomes very short, tension is decreased during contraction because of thin filament overlap, because the thick filaments are compressed against the Z lines, and because not as much Ca2+ is released during excitation-contraction coupling. e. the tension that can be achieved during a tetanic contraction is less when a muscle is shorter or longer than its optimal length at the onset of contraction.
In which of the following spaces is the pterygoid plexus of veins located?
A. Temporal B. Infratemporal C. Buccal D. Parapharyngeal