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Regarding the anatomy of the lungs and muscles in respiration:
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A. Correct.
B. Incorrect. The right middle lobe is adjacent to the right heart border.
C. Incorrect. The main bronchi contain complete rings of cartilage; C-shaped rings are found in the trachea.
D. Incorrect. The innervation of the diaphragm is from the phrenic nerves (C3-5); epidural block to T4 for caesarean section does not affect the function of the diaphragm.
E. Incorrect. Expiration is passive during quiet breathing.
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