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Chapter 34: Problem 30

Which germ layer forms the skin cells? a. endoderm b. ectoderm c. mesoderm d. trophoblast

Short Answer

Expert verified
b. ectoderm

Step by step solution

01

- Understanding Germ Layers

The three primary germ layers in early embryonic development are the ectoderm, mesoderm, and endoderm. Each germ layer gives rise to different tissues and organs.
02

- Identifying the Ectoderm

The ectoderm is the outermost germ layer and is responsible for forming the outermost layers of the body.
03

- Functions of the Ectoderm

The ectoderm forms structures such as the nervous system and the epidermis, which is the outer layer of the skin.
04

- Selecting the Correct Answer

From the choices provided, identify which option correctly states that the ectoderm forms the skin cells.

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Key Concepts

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

ectoderm
In embryonic development, the ectoderm is the outermost of the three primary germ layers. Each germ layer ultimately develops into specific tissues and organs. The ectoderm differentiates into structures that form the outer layers of the body.

It plays a crucial role in the formation of the skin and the nervous system.
  • The ectoderm develops into the epidermis, the outermost layer of the skin.
  • It also forms the brain and spinal cord, which are essential parts of the nervous system.
  • Other structures derived from the ectoderm include hair, nails, and certain glands.
The term 鈥渆ctoderm鈥� combines two parts: 'ecto-' meaning outer and '-derm' meaning skin, underscoring its significance in forming outer body layers.
skin cells
Skin cells are derived from the ectoderm during embryonic development. The primary function of these cells is to form protective barriers. There are different types of skin cells, each with its specific role:
  • Keratinocytes: Make up the majority of skin cells and produce keratin, a protein that provides strength and resilience.
  • Melanocytes: Produce melanin, the pigment responsible for skin color and protection against UV radiation.
  • Langerhans cells: Part of the immune system, these cells help defend the body against pathogens.
  • Merkel cells: Involved in the sensation of touch.
Overall, skin cells are essential for protecting internal organs, regulating body temperature, and sensing environmental changes.
embryonic development
Embryonic development is a complex process that transforms a single fertilized egg into a fully formed organism. This process involves several stages:

The fertilized egg, or zygote, undergoes multiple cell divisions to form a blastocyst. From the blastocyst, three primary germ layers emerge:
  • Ectoderm: Forms the skin, nervous system, and other structures.
  • Mesoderm: Develops into muscles, bones, and the circulatory system.
  • Endoderm: Gives rise to the lining of the digestive and respiratory systems.
Each germ layer lays the foundation for specific tissues and organs. Proper embryonic development is critical for the formation of a healthy organism, and any disruptions in this process can lead to developmental disorders.

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Most popular questions from this chapter

In sexual reproduction, two cells of a species combine to form another cell. Why is this useful? a. It produces new combination of genes, which enables offspring to survive during environmental changes. b. It results in the production of many offspring in a short period of time. c. It does not involve gamete formation and requires less energy. d. It allows immobile organisms to reproduce in the absence of a mate.

What is necessary for normal human fertilization to occur? a. Many eggs must be released. b. The uterus must be enlarged. c. One sperm needs to penetrate one egg. d. Secretion of pituitary FSH and LH must decrease.

Why are the diploid zygotes produced after fertilization of sperm cells produced by spermatogenesis not similar? a. Their chromosome numbers are not the same. b. The size of the sperm produced are different. c. Some sperm may have a tail, whereas others may not. d. Crossing over occurs during spermatogenesis.

Which form of reproduction might be utilized by a sexually reproducing animal that has limited mobility? a. fragmentation b. budding c. hermaphroditism d. parthenogenesis

What is the advantage of sexual reproduction? a. Sexual reproduction allows animals to conserve resources and reproduce only during optimal conditions. b. Sexual reproduction results in offspring with diverse phenotypes, which may enhance survival of a population in a changing environment. c. Sexual reproduction guarantees that both parents will provide parental care. d. Sexual reproduction yields more numerous offspring more rapidly than is possible with asexual reproduction.
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