Physio final: respiratory system part 2

What are the 3 physical factors that influence pulmonary ventilation?

• airway resistance

• alveolar surface tension

• lung compliance

Represents friction and is a major non-elastic source of resistance to gas flow.

• Alveolar surface tension

• lung compliance

• airway resistance

Where does airway resistance occur?

• intrapleural cavity

• intrapulmonary space

• in the airways

F= delta P/R

• True

• False

Gas flow changes inversely with resistance.

• True

• False

Answer explanation

As resistance increases, gas flow decreases

Resistance is usually very significant.

• True

• False

Answer explanation

Resistance is usually insignificant

Where is resistance greatest?

• small bronchioles

• medium sized bronchi

• large bronchi

Answer explanation

Where does resistance dissapear?

• medium sized bronchi

• terminal bronchioles

• trachea

As airway resistance rises, breathing becomes ___ strenuous.

• more

• less

dilates bronchioles and reduces air resistance

• epinephrine

• not this