A 43-year-old female patient has been lying down on the hospital bed for more than 4 months. Her normal, quiet expiration is achieved by contraction of which of the following structures?
(A) Elastic tissue in the lungs and thoracic wall
(B) Serratus posterior superior muscles
(C) Pectoralis minor muscles
(D) Serratus anterior muscles
A. Elastic tissue in the lungs and thoracic wall