单选题 The nurse is caring for a toddler in respiratory arrest. The nurse will assist with endotracheal intubation and use an uncurled tube because the
A. vocal cords provide a natural seal.
B. trachea is shorter.
C. larynx is anterior and cephalad.
D. cricoid cartilage is the narrowest part of the larynx.

【正确答案】 D

【答案解析】The cricoid cartilage in the toddler is the narrowest part of the larynx and provides a natural seal. This keeps the endotracheal tube in place without requiring a cuff. The vocal cords are narrower in an adult. The trachea is shorter and the larynx is anterior and cephalad, but these aren't reasons to choose an uncurled tube.