Q: During a spirometry test, a student measures the following: Tidal Volume (TV) = 500 mL, Inspiratory Reserve Volume (IRV) = 2500 mL, Expiratory Reserve Volume (ERV) = 1000 mL, and Residual Volume (RV) = 1200 mL. What is the student’s Total Lung Capacity (TLC)?

$$ TLC = TV + IRV + ERV + RV = 5200 \text{ mL} $$

Q: A healthy adult’s spirogram shows a Tidal Volume (TV) of 500 mL and a Respiratory Rate (RR) of 12 breaths per minute. What is the Minute Respiratory Volume (MRV)?

$$ MRV = TV \times RR = 500 \times 12 = 6000 \text{ mL/min} $$

Question 1

Which of the following best describes the function of the diaphragm during inspiration?

Accepted Answer

The diaphragm contracts and moves downward, increasing thoracic volume.

Question 2

A patient’s spirometry results show a reduced Forced Vital Capacity (FVC) and a normal Forced Expiratory Volume in 1 second (FEV1). Which condition is most likely indicated by these findings?

Accepted Answer

Restrictive pulmonary disease such as pulmonary fibrosis

Question 3

Which equation correctly represents the calculation of Vital Capacity (VC) using respiratory volumes?

Accepted Answer

$$ VC = TV + IRV + ERV $$

Question 4

During a spirometry test, a student measures the following: Tidal Volume (TV) = 500 mL, Inspiratory Reserve Volume (IRV) = 2500 mL, Expiratory Reserve Volume (ERV) = 1000 mL, and Residual Volume (RV) = 1200 mL. What is the student’s Total Lung Capacity (TLC)?

Accepted Answer

$$ TLC = TV + IRV + ERV + RV = 5200 	ext{ mL} $$

Question 5

Which of the following best explains why calibration of spirometry equipment is necessary before recording pulmonary data?

Accepted Answer

To verify the accuracy of volume measurements and minimize systematic error

Question 6

A healthy adult’s spirogram shows a Tidal Volume (TV) of 500 mL and a Respiratory Rate (RR) of 12 breaths per minute. What is the Minute Respiratory Volume (MRV)?

Accepted Answer

$$ MRV = TV 	imes RR = 500 	imes 12 = 6000 	ext{ mL/min} $$

Question 7

Which respiratory volume cannot be measured directly by spirometry and must be estimated?

Accepted Answer

Residual Volume (RV)

Question 8

A patient is asked to exhale as forcefully and quickly as possible after a maximal inhalation. Which measurement is being recorded?

Accepted Answer

Forced Vital Capacity (FVC)

Question 9

Which of the following best describes the physiological process occurring at the tissues as shown in Figure 37.15?

Accepted Answer

Oxygen is released from hemoglobin and carbon dioxide is picked up by red blood cells.

Question 10

A student incorrectly places the calibration syringe onto the airflow transducer during spirometry setup. What is the most likely consequence?

Accepted Answer

The calibration data will be inaccurate, leading to erroneous pulmonary measurements.

Question 11

Which of the following formulas correctly calculates Inspiratory Capacity (IC)?

Accepted Answer

$$ IC = TV + IRV $$

Question 12

During normal quiet breathing, which muscles are primarily responsible for inspiration?

Accepted Answer

External intercostals and diaphragm

Question 13

A patient’s spirogram shows a decreased FEV1/FVC ratio. Which of the following is most likely?

Accepted Answer

Obstructive lung disease

Question 14

Which of the following best describes the purpose of highlighting data for the inhalation of the third breath during pulmonary data analysis?

Accepted Answer

To isolate a specific breath for accurate measurement of respiratory volumes

Question 15

If a patient’s Expiratory Reserve Volume (ERV) is 1200 mL and Tidal Volume (TV) is 500 mL, what is the minimum volume of air that can be exhaled in a single breath?

Accepted Answer

$$ 1700 	ext{ mL} $$

Question 16

Which of the following is a plausible reason for using a wet spirometer instead of a dry spirometer in a laboratory setting?

Accepted Answer

Wet spirometers provide more accurate measurements of lung volumes.

Question 17

A patient with chronic obstructive pulmonary disease (COPD) is likely to show which of the following changes in their spirogram?

Accepted Answer

Decreased FEV1 and decreased FEV1/FVC ratio

Question 18

Which of the following best describes the effect of the rib cage during inspiration?

Accepted Answer

The rib cage expands and moves upward, increasing thoracic volume.

Question 19

A student is analyzing a computer-generated spirogram and notices irregularities in the data. Which step should be taken first to ensure accurate results?

Accepted Answer

Repeat the calibration procedure to check for equipment error.

Respiratory System Physiology: Volumes, Capacities, and Spirometry

Study Guide - Practice Questions

Study Guide - Flashcards