Question

Expiratory reserve volume (ERV) You ask your lab partner to inspire a normal tidal inspiration, and breathe out a normal tidal expiration, then exhale as forcibly as possible into the spirometer mouthpiece. As before, several measurements were taken. a. Measurement 1: 800 b. Measurement 2: 850 c. Measurement 3: 780 2 10 points
Calculate the average expiratory reserve volume (ERV). Round to the nearest whole number. Your lab partners average expiratory reserve volume (ERV) is​

Answer 1

The average expiratory reserve volume or ERV is 810.

What is expiratory reserve volume?

• Expiratory reserve volume or ERV is the amount of air that is exhaled forcibly.
• This can be measured using a spirometer and is used to detect restrictive lung diseases.
• It is the maximum amount of air that can be exhaled after normal tidal volume is exhaled.
• Respiratory volume is the volume of air which is either inhaled, exhaled or stored in your lungs.
• The doctors estimate the reserve volume with the help of spirometer to determine some lung diseases.
• Once diagnosed with a lung disease, spirometry is used to monitor it.
• Here, 3 readings of ERV are taken, calculate the sum of the these and divide by 3 to calculate the average ERV.
• ERV= (800+ 850+ 780)/ 3= 810

Learn about tidal volume here:

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