Selecciona dos estructutas que forman parte del sistema respiratorio, luego establece diferencias y semejanzas entre ellos.

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.