I would love to answer this but you gave no options to choose from:(
Answer:
it is the average period of time a person can expect to live.
Explanation:
Answer:
C. The intrathoracic pressure decreases.
Explanation:
Inspiration is when air is moved into the lungs. This occurs when:
- The diaphragm contracts, which increases the size of the chest cavity.
- Then the lungs expand, which decreases intrathoracic pressure, causing air to rush into the lungs.
