A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: A) smooth muscle B) skeletal muscle C) respiratory cilia D) rings of cartilage

A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of:

A) smooth muscle
B) skeletal muscle
C) respiratory cilia
D) rings of cartilage

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A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: A) smooth muscle B) skeletal muscle C) respiratory cilia …

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