In breathing movements, air volume can be estimated by
1. stethoscope
2. hygrometer
3. sphygmomanometer
4. spirometer
. (d) Spirometeris - the device used to measure the volumeof air involved in breathing movements and it also helps in clinical assessment of pulmonary functions.
Stethoscope - is a medical device used for listening the internal sounds of an animal or human body.
human body.
Hygrometeris - a device used for measuring the moisture contentin the atmosphere,ie., humidity.
Sphygmomanometer - is a device that is used to measure blood pressure.
