Researchers administered a drug to mountain climbers in one condition and gave a placebo to climbers in a second condition. The investigators then measured how well the climbers slept at an altitude of 17,000 feet

When insulin levels are low:

a. Glucose is available only to the nervous system b. Glucose is available to all cells in the body c. Glucagon triggers the storage of fats d. The liver converts glucose to glycerol for use in the brain

What is the best advice concerning successful aging?

a. Older adults need to keep active and engaged. b. Older adults need to be allowed to disengage. c. Older adults should be encouraged to find a good fit between their personality, preferences, and the environment in which they live. d. Successful aging in older adults is virtually impossible to find.