Certificate In Psychology (CPSY) Practice Exam

What characteristic is associated with the endoderm layer during embryonic development?

1. Formation of skin and nervous system

2. Development of the respiratory and digestive systems

3. Creation of muscles and bones

4. Development of blood vessels

The correct answer is: Development of the respiratory and digestive systems

The endoderm layer during embryonic development is primarily responsible for forming the internal linings of various systems within the body, particularly the respiratory and digestive systems. This layer gives rise to important structures such as the lining of the gastrointestinal tract, the lungs, and various associated organs such as the liver and pancreas. Understanding the function of the endoderm is crucial because it highlights the foundational role this germ layer plays in developing essential systems that maintain bodily functions. The other layers of the embryo are responsible for different structures: the ectoderm gives rise to the skin and nervous system, while the mesoderm is involved in forming muscles, bones, and blood vessels. Thus, recognizing the role of the endoderm in developing the respiratory and digestive systems is essential for comprehending embryological development and the specialization of cell layers.