# Respiratory Physiology and Spirometry Quiz

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## 20 Questions

Teaching

VE = TV x RR

mL/min

FEV1 = FVC / VC

70%-80%

### What do chemoreceptors monitor in the regulation of breathing?

Changes in concentrations of H+, PCO2, and PO2

In the medulla

### What happens to PO2 and PCO2 levels during hyperventilation?

PO2 rises and PCO2 falls

### What effect does hyperventilation have on breath holding time?

Increases breath holding time

Figure 23.24

Tidal volume

Vital capacity

### What is the equation for pulmonary ventilation?

Tidal volume × Respiration rate

### What is the typical amount of pulmonary ventilation in mL/minute?

500 mL × 12 breaths/min

Residual volume

### What is the equation for inspiratory capacity?

Tidal volume + Inspiratory reserve volume

### Which capacity represents the volume left in the lungs after a quiet expiration?

Functional residual capacity

### Which volume represents the amount of air that can be forcibly inhaled beyond the tidal volume?

Inspiratory reserve volume

### What is the equation for vital capacity?

Tidal volume + Inspiratory and expiratory reserve volumes

### Which capacity represents the maximum volume of air that the lungs can hold?

Total lung capacity

## Study Notes

### Respiratory System

• To access the Spirogram, you need to open a Pulmonary Function Testing program.
• The formula for calculating Pulmonary Ventilation (VE) is VE = TV x f, where TV is tidal volume and f is breathing frequency.
• The unit of measurement for Pulmonary Ventilation (VE) is liters per minute (L/min).
• The formula for calculating Forced Expiratory Volume in 1 second (FEV1) is FEV1 = volume of air exhaled in the first second of forced expiration.
• The normal range for the percentage of vital capacity expired in 1 second (FEV1.0/FVC ratio) is 80-85%.

### Regulation of Breathing

• Chemoreceptors monitor the levels of oxygen and carbon dioxide in the blood to regulate breathing.
• Central chemoreceptors are located in the medulla oblongata.
• During hyperventilation, PO2 levels increase and PCO2 levels decrease.
• Hyperventilation shortens breath holding time.

### Respiratory Volumes and Capacities

• Figure number 12 shows Respiratory Volumes and Capacities.
• Compliance is measured by the volume of Residual Volume (RV).
• The total amount of air a person can exchange through forced breathing is represented by the Vital Capacity (VC).
• The equation for pulmonary ventilation is VE = TV x f, where TV is tidal volume and f is breathing frequency.
• The typical amount of pulmonary ventilation is 5000 mL/minute.
• The volume of air left in the lungs after the most forceful expiration is the Residual Volume (RV).
• The equation for inspiratory capacity is IC = TLC - FRC, where IC is inspiratory capacity, TLC is total lung capacity, and FRC is functional residual capacity.
• The volume left in the lungs after a quiet expiration is the Functional Residual Capacity (FRC).
• The volume that can be forcibly inhaled beyond the tidal volume is the Inspiratory Reserve Volume (IRV).
• The equation for vital capacity is VC = IRV + TV + ERV, where VC is vital capacity, IRV is inspiratory reserve volume, TV is tidal volume, and ERV is expiratory reserve volume.
• The maximum volume of air that the lungs can hold is the Total Lung Capacity (TLC).

Test your knowledge of respiratory physiology and spirometry measurements with this quiz. Learn about the different volumes and capacities measured by a spirometer and how they can be used to assess respiratory health. Explore standard values for different age groups and understand the significance of tidal volume and inspiratory reserve volume.

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