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Chapter 29: Problem 7

A human baby's skin develops from a. ectoderm. b. mesoderm. c. endoderm. d. trophoderm.

Short Answer

Expert verified
a. ectoderm

Step by step solution

01

- Identify the Germ Layers

The first step is to understand the three primary germ layers formed during embryonic development. They are the ectoderm, mesoderm, and endoderm. Each layer gives rise to specific tissues and organs.
02

- Determine the Origin of Skin

Next, determine which germ layer is responsible for the development of skin. The skin and its appendages (hair, nails, glands) develop from the ectoderm.
03

- Recognize Other Germ Layers' Contributions

Understand the roles of other germ layers. The mesoderm forms muscles, bones, and the circulatory system. The endoderm forms internal structures, like the gastrointestinal tract and lungs. The trophoderm contributes to the placenta, not the skin.
04

- Select the Correct Option

Based on the breakdown of germ layer functions, the correct answer is ectoderm. Therefore, the correct option is a. ectoderm.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

ectoderm
The ectoderm is one of the three primary germ layers formed during the early stages of embryonic development. It is the outermost layer, and it gives rise to a variety of structures and tissues in the human body. One of the most important roles of the ectoderm is to form the skin, including the epidermis, which is the outer layer of the skin. Additionally, the ectoderm differentiates into the nervous system, including the brain and spinal cord.

Other derivatives of the ectoderm include:
  • Hair
  • Nails
  • Glands (such as sweat and sebaceous glands)
  • Parts of the eye (like the lens and cornea)
The knowledge of the ectoderm's role can help us understand various developmental processes and congenital conditions that may arise if there are issues in this germ layer.
mesoderm
The mesoderm is the middle germ layer that forms during embryonic development, lying between the ectoderm and the endoderm. It plays a crucial role in the growth and development of many systems in the body. Structures that arise from the mesoderm include:
  • Muscles
  • Bones
  • Blood vessels and the circulatory system
  • Kidneys
  • Reproductive organs
Understanding the mesoderm's role is essential for comprehending how various bodily systems develop and integrate from early stages of life.
endoderm
The endoderm is the innermost germ layer formed during embryonic development. It gives rise to a number of internal structures, predominantly associated with the gastrointestinal and respiratory systems. The endoderm forms the lining of the digestive tract, from the mouth to the anus, including the liver and pancreas. It also contributes to the development of the lungs and other respiratory structures.

Key structures derived from the endoderm include:
  • Stomach
  • Intestines
  • Liver
  • Pancreas
  • Lungs
By understanding the endoderm's contributions, we can better grasp how essential internal organs form and function within the body.

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Most popular questions from this chapter

During implantation, the blastocyst implants itself in a. the endometrium. b. the oviduct. c. an ovum. d. the trophoblast.

Human fertilization normally takes place in the a. oviduct. b. vagina. c. ovary. d. uterus.

Which of the following stages comes first in the development of a human? a. gastrula b. zygote c. fetus d. blastoeyst

A zygote is formed a. just prior to fertilization. b. when more than one sperm fertilizes the same egg. c. within the ectoderm of a blastula. d. when sperm and egg nuclei fuse.

As development of an embryo continues, a. pluripotent stem cells develop from the endoderm. b. gastrulation produces a blastula. c. mesoderm gives rise to heart muscle. d. endoderm gives rise to ectoderm.
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