Question 19
RespirationWhich of the following movements occur during exhalation?
- A.The diaphragm and intercostal muscles relax
- B.The thoracic cavity increases in volume
- C.The diaphragm and intercostal muscles contract
- D.The diaphragm contracts and the intercostal muscles relax.
Show the answer and explanation
Answer: A (The diaphragm and intercostal muscles relax)
Explanation
When breathing out, the diaphragm and external intercostal muscles relax, the chest gets smaller and air is pushed out.