Beta-blockers ________.
A) increase a dangerously low heart rate
B) decrease heart rate and blood pressure
C) have widespread sympathetic effects
D) are potent antidepressants
B) decrease heart rate and blood pressure
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Small desert mammals are often osmotically stressed in addition to being heat stressed; therefore they will want to
a. avoid heat loss by evaporative cooling and instead employ heat storage mechanisms to deal with heat stress. b. avoid heat loss by evaporative cooling and instead burrow to seek cooler microclimates. c. avoid heat loss by evaporative cooling and instead restrict their activity to night when ambient temperatures are cooler. d. avoid heat loss by entering into extended periods of sleep and inactivity during the summer (estivation) which is similar to hibernation by some animals in the winter. e. avoid heat loss by evaporative cooling by burrowing and restricting activity to times with cooler temperatures.
The rough endoplasmic reticulum is most abundant in cells specialized for protein secretion, whereas smooth endoplasmic reticulum is abundant in cells that specialize in lipid metabolism
Indicate whether the statement is true or false
The root of a tooth is covered by
A) enamel. B) cement. C) dentin. D) pulp. E) the root canal.
Obesity may be caused by
A. metabolism. B. hormones. C. social factors. D. All apply.