Question

Respiratory system is derived from

• A. Ectoderm
• B. Endoderm
• C. Both A and B
• D. Endoderm and mesoderm

Answer 1

Answer: (D)

Endoderm and mesoderm

• The respiratory system represents the organs that are involved in the exchange of oxygen and carbon dioxide between the organism and the environment.
• In animals, a primary layer of cells is formed during embryogenesis, three in number and are differentiated as ectoderm, mesoderm, and endoderm. The tissues produced by these layers give rise to the organs of the body.
• The respiratory tract with tracheae, bronchi, alveoli of the lungs is developed from the endoderm. The mesoderm forms the mesothelium from which lines the thoracic cavity and external intercostal muscles.
  Hence, the correct answer is D.