All salts are ions, but not all ions are salts.
Indicate whether the statement is true or false.
Answer: True
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When a hormone is present in excessive levels, the number of target-cell receptors may decrease. This is called
a) receptor recognition. b) sensory adaptation. c) paracrine regulation. d) up-regulation. e) down-regulation.
A rise in cortisol would cause an increase in each of the following except
A) the rate of glucose synthesis by the liver. B) the rate of glycogen formation by the liver. C) the level of fatty acids in the blood. D) fatty acid metabolism by muscle cells. E) ACTH levels.
The vermiform appendix:
a. produces enzymes that assist in fat digestion b. gets its name because it looks like a worm c. is important in the reabsorption of bile d. none of the above
From the list, indicate three types of molecules that are permeable to the blood-brain barrier. (Check all that apply.)
A. Oxygen B. Caffeine C. Glucose D. All drugs E. Large proteins