A/P: Unit 4- the Steps of the Airflow/ Pressure for Inspiration/ Expiration

What is takes place in the 3rd step in Inspiration?

the Inrapulmonic Pressure Drops Lower than Atmospheric Pressure, resulting in; -Air flow down the Pressure Gradient Into the Lungs

What is takes place in the 2nd step in Expiration?

the Lungs are Compressed by the Thoracic Cage

What causes the Intrapulmonic Pressure to Drop?

when the Lungs Expand, the Volume of Air spreads and enlarges the space, which results in; -Pressure in Bronchi/ Alveoli to Drop

How many Steps take place in the Airflow/ Pressure for Expiration to occur?

3 Steps

How many steps take place in the Airflow/ Pressure for Inspiration to occur?

3 Steps

What is takes place in the 1st step in Expiration?

Diaphragm/ External Intercostal Muscles Relax; -Thoracic Cage Springs back to original size

What is takes place in the 1st step in Inspiration?

Intercostal Muscles Contract= Pulling the Ribs Up+Out AND the Diaphragm Contracts/ Moves Downward; -which enlarges the Chest Cavity in all Directions

What is takes place in the 3rd step in Expiration?

Intrapulmonary Pressure Rises; -Air flows down the Pressure Gradient and out of the Lungs

What is takes place in the 2nd step in Inspiration?

Lungs Expand along with the Chest

Why does the Lungs Expand along with the Chest?

due to Intrapleural Pressure, the Visceral Pleura follows the Parietal Pleura; -Pulling the Lung along with it