Heart rate is measured by counting the number of beats per minute. Someone's normal heart rate depends on things like the person's age and whether he or she leads an active lifestyle. The resting heart rate decreases as people get older. Typical normal resting heart rate ranges are: 1  babies (birth to 3 months of age): 100â150 beats per minute. 2  kids 1â3 years old: 70â110 beats per minute. 3  kids by age 12: 55â85 beats per minute.
A respirator is a piece of protective respiratory equipment designed to protect the wearer from inhaling harmful particulate matter (as in dusts, including airborne microrganisms), fumes, vapors, or gases.
List of terms related to Respirometer Editor-In-Chief: C. Michael Gibson, M.S., M.D. A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and carbon dioxide. They allow investigation into how factors such as age or the effect of light affect the rate of respiration.