Egan Chapter 11 Flashcards

Questions and Answers

Which airway generations comprise the conducting zones?

0 (trachea) to 16 (terminal bronchiole)

Which airway generations comprise the respiratory zones?

17 (respiratory bronchiole) to 23 (alveolar sac)

Where does gas exchange take place?

In the alveoli

Does the conducting zone take part in gas exchange?

False Signup and view all the answers

What is the dead space?

The part of inhaled tidal volume that stays in the conducting airways and does not participate in gas exchange. Signup and view all the answers

What is the anatomical dead space?

The volume of air that occupies the conducting airways. Signup and view all the answers

What is the physiological dead space?

The part of inhaled tidal volume that does not participate in gas exchange and the part of exhaled tidal volume that cannot eliminate CO2. Signup and view all the answers

What is the difference between anatomical and physiological dead space?

In healthy lungs, they are very close, if not the same. In patients with chronic lung disease, physiological dead space can be very high. Signup and view all the answers

What comprises physiological dead space?

(anatomic dead space) + (alveolar dead space) Signup and view all the answers

What is alveolar dead space?

When alveolar capillaries are obstructed, and inhaled air cannot participate in gas exchange. Signup and view all the answers

How to measure the physiological dead space?

Measure the amount of CO2 eliminated from the lung in a single tidal volume. Signup and view all the answers

How to measure the physiological dead space?

Signup and view all the answers

Study Notes

Conducting and Respiratory Zones

Conducting zones include airway generations from 0 (trachea) to 16 (terminal bronchiole).
Respiratory zones consist of airway generations from 17 (respiratory bronchiole) to 23 (alveolar sac).

Gas Exchange

Gas exchange occurs in the alveoli, which are found exclusively in the respiratory zone.

Conducting Zone and Gas Exchange

The conducting zone does not participate in gas exchange, acting as an anatomical dead space where incoming tidal volume does not reach alveoli.

Dead Space Definition

Dead space refers to the portion of inhaled tidal volume that remains in the conducting airways without entering the alveolar space, thus not participating in gas exchange.

Anatomical Dead Space

Anatomical dead space is defined as the volume of air contained within the conducting airways.

Physiological Dead Space

Physiological dead space comprises the portion of inhaled tidal volume that does not facilitate gas exchange and the portion of exhaled tidal volume that fails to eliminate carbon dioxide.

Comparison of Dead Spaces

In healthy lungs, anatomical and physiological dead spaces are generally similar.
In patients with chronic lung disease, physiological dead space can be significantly elevated.

Components of Physiological Dead Space

Physiological dead space is the sum of anatomical dead space and alveolar dead space.

Alveolar Dead Space

Alveolar dead space occurs when alveolar capillaries are obstructed, as seen in conditions like pulmonary embolism, preventing effective gas exchange.

Measurement of Physiological Dead Space

Physiological dead space can be measured by assessing the amount of carbon dioxide eliminated during a single tidal volume.

Description

Test your knowledge on the airway generations and zones of the respiratory system with these flashcards based on Egan's Chapter 11. This quiz covers the conducting and respiratory zones, including where gas exchange occurs. Perfect for students looking to reinforce their understanding of respiratory anatomy.