Gas Exchange III - Mechanism of Ventilation 2

How do air molecules move? (2)

What happens when you move down the bronchiole tree?

What airway generation do the alveoli occur?

How does the total trans-sectional area differ in the different zones of the respiratory tract?

How does the movement of gas molecules occur in the conducting zone?

How does the movement of gas molecules occur in the respiratory zone?

Describe laminar flow (3)

What is Poiseuille's Law?

Re-arrange Poiseuille's law to show the effect of reducing the radius of the airway

Describe turbulent flow (3)

Describe transitional flow (3)

Where does majority of airway resistance occur?

What effect does ^ lung volume have on Raw?

What effect does radial traction have?

How does radial traction occur?

Why does this decrease Raw?

Conditions leading to Dynamic Compression

When does Dynamic Compression occur?

Type of airflow through constricted airways

If intrathoracic p > atmospheric p then:

What type of change in bronchial smooth muscle tone produces which effect on RAW?

What are the causes of bronchioconstriction? (4)

What stimulates bronchiodilation? (2)

What is the effect of inflammation on RAW?

How does inflammation cause this change in RAW?

Draw a diagram showing how increased airway resistance increases the work of breathing

Why does expiration have to be active?

What is elastic recoil determined by?

What sort of fibres are found in alveolar walls and around vessels and bronchi?

What is the function of these fibres?

How does the fluid lining alveoli facilitate gas exchange?

What is "pulmonary surfactant"

What are the mechanical functions of surface? (2)

What problems can arise because of this high attraction force?

What are the roles of the pulmonary surfactant?

Where is pulmonary surfactant found?

Under what conditions is compliance reduced? (2)