Bioavailability of a drug is affected by the a. time of year in which the medication is administered. b. metabolic rate of the patient. c. measurement system in which the medication dosage was calculated. d. gastrointestinal system and absorption rates.

i think your answer is c. measurement system in which the medication dosage was calculated.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.