Question 1
When alveolar pressure is equal to atmospheric pressure, air flows into the lungs.
◦ True
◦ False
Question 2
Active expiration is produced by contraction of
◦ internal intercostals only.
◦ abdominal muscles only.
◦ diaphragm only.
◦ abdominal muscles and internal intercostals.
◦ external intercostals only.