Concept #1: Inspiration
Concept #2: Expiration
Practice: 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?
Practice: 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.)