What is the role of the primary germ layers in human development?

• A. They are responsible for the initial formation of the nervous system only.
• B. They provide nutrients to the developing embryo.
• C. They form the basic tissues and organs of the body.
• D. They regulate the genetic material of the embryo.

Answer: (C)

Verified step by step guidance

1. Understand that the primary germ layers are the three layers of cells (ectoderm, mesoderm, and endoderm) formed during the early stages of embryonic development.
2. Recognize that each germ layer gives rise to specific tissues and organs in the body. The ectoderm forms structures such as the skin and nervous system, the mesoderm forms muscles, bones, and the circulatory system, and the endoderm forms the lining of the digestive and respiratory systems.
3. Acknowledge that the primary germ layers are not limited to forming the nervous system only; they are responsible for forming all basic tissues and organs.
4. Clarify that the primary germ layers do not provide nutrients to the developing embryo; this function is primarily performed by the placenta.
5. Note that the primary germ layers do not regulate the genetic material of the embryo; genetic regulation is a complex process involving DNA and various cellular mechanisms.