Q:

Development of which of the following is the first sign of respiratory system develop- ment?

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Development of which of the following is the first sign of respiratory system develop-ment?


  1. Tracheoesophageal septum
  2. Hypobranchial eminence
  3. Primitive foregut
  4. Tracheoesophageal fistula
  5. Respiratory diverticulum

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E. Development of the respiratory system begins in week 4; the first sign of development is formation of the respiratory diverticulum in the ventral wall of the primitive foregut.

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