Question

question 1 1 pts during inhalation which of the following occurs? a negative pressure vacuum is created in the thoracic cavity. the diaphragm contracts and arches upward. the abdominal muscles contract. none of these are correct. 2 of these are correct.

Explanation:

• During inhalation, the diaphragm contracts and moves downward (not arches upward).
• Abdominal muscles relax during normal inhalation (they contract during forced exhalation).
• A negative pressure (lower than atmospheric pressure) is created in the thoracic cavity which causes air to flow in.

Answer:

A. A negative pressure vacuum is created in the thoracic cavity.