Ventilation II: Mechanics of Inspiration and Expiration

Concept: Inspiration


Concept: Expiration


Problem: The diaphragm, external intercostal, and sternocleidomastoid muscles contract. Which of the following describes the effect of this muscle activity on the volume of the thoracic cavity?


Problem: A (very good) father is blowing up 100 pink balloons while decorating the house for his daughter’s birthday party. Which of the following muscles is/are likely to be actively contracting while he is blowing air into a balloon? (Choose all that apply.)