Exam5 Ch 21 Respiratory Fxn

Question 1

• active phase
• drawing in of air into lungs
• diaphragm contracts and drops
• size of chest cavity increases/pressure in chest cavity decreases
• external intercostals contract and elevate the rib cage

Answer 1

Inspiration (Inhalation)

Question 2

principal muscle of inspiration

Answer 2

Diaphragm

Question 3

• passive phase: elastic recoil of muscles that were stretched during inspiration
• expelling of air from lungs
• diaphragm relaxes and elevates
• size of chest cavity decreases/pressure in chest cavity increases
• external intercostals relax and lower the rib cage

Answer 3

Expiration (Exhalation)

Question 4

pressure inside the airways and alveoli of the lungs

Answer 4

Intrapulmonary/Alveolar Pressure

Question 5

pressure in the pleural cavity

Answer 5

Intrapleural Pressure

Question 6

pressure in the thoracic cavity

Answer 6

Intrathoracic Pressure

Question 7

• ability to stretch
• ease that lungs and thorax is expanded during inspiration
• depends on elasticity of lung tissue and surface tension in the alveoli

Answer 7

Compliance