dead space

Question 1

Where does gas exchange between air and blood primarily take place?

Answer 1

At the alveolar surface

Gas exchange occurs specifically at the alveoli in the lungs.

Question 2

What is the volume of the conducting airways?

Answer 2

About 150 ml

This volume is significant as it represents the space where no gas exchange occurs.

Question 3

What term describes the space within the conducting airways that does not permit gas exchange?

Answer 3

Anatomic dead space

This space is also referred to as anatomical dead space (Vo).

Question 4

What does anatomical dead space refer to?

Answer 4

Volume of the lung that is not alveoli

It specifically denotes areas in the lungs where gas exchange cannot occur.

Question 5

How can anatomical dead space be measured?

Answer 5

By the nitrogen content in expired gas after inhaling 100% pure oxygen

Initially, N2 content will be zero, then rise to 80% as gas from non-alveolar regions is exhaled.

Question 6

True or False: Anatomical dead space includes the alveoli.

Answer 6

False

Anatomical dead space specifically excludes alveolar regions.

Question 7

Fill in the blank: The volume of the conducting airways is approximately ______ ml.

Answer 7

150 ml

This volume is crucial for understanding lung mechanics.

Question 8

What happens to nitrogen content during the exhalation of a breath after inhaling pure oxygen?

Answer 8

Initially zero, then rises to 80%

This pattern indicates the transition from dead space gas to alveolar gas.