During Normal Expiration

Multiple Choice

During normal expiration,

A) elastic recoil of stretched muscles helps return the thorax to its resting volume.
B) the internal intercostal muscles are required.
C) the abdominal muscles become involved.
D) elastic recoil of stretched muscles helps return the thorax to its resting volume and the internal intercostal muscles are required.
E) elastic recoil of stretched muscles helps return the thorax to its resting volume, the internal intercostal muscles are required, and the abdominal muscles become involved.