Respiratory System

Question 1

Trachea

Answer 1

Flexible + mobile tube extending from the larynx
-Covered in hyaline cartilage

Question 2

Alveoli

Answer 2

Provide a lot of surface area and allow for gas exchange by simple diffusion.

Question 3

Steps of Inspiration

Answer 3

-Intercostal muscles contract
- Rib cage rises
-Lungs stretch +volume increases
- Pressure drops below atmospheric pressure
- Air flows into the lungs until internal=atmospheric

Question 4

Steps of Expiration

Answer 4

• Rib cages descends due to gravity
• Thoracic cavity volume decreases
• Elastic lungs recoil passively
• Internal Pressure >atmospheric
• Gas flows out of the lungs