91Ó°ÊÓ

Explain what the mesoderm is and what it eventually differentiates into. a. The mesoderm, located on either side of the vertebrate neural tube, develops into various connective tissues. It is reorganized into groups of cells called somites, which develop into facial cartilage, ribs, and lungs. b. The mesoderm, located at the border of the neural plate and the non-neural ectoderm, develops into various connective tissues such as the ribs, lungs, segmental muscle, and the notochord, which forms the central axis of the animal body. c. The mesoderm, located on either side of the vertebrate neural tube, develops into various connective tissues. It is reorganized into groups of cells called somites, which develop into ribs, lungs, segmental muscle, and the notochord. d. The mesoderm, located at the border of the neural plate and the non-neural ectoderm, develops into various connective tissues such as the facial cartilage, ribs, and lungs.

Step by step solution

01

Identify the Question

The task is to explain what the mesoderm is and what it eventually differentiates into.

02

Understand the Role of Mesoderm

The mesoderm is one of the three primary germ layers in the early embryo. It is located on either side of the vertebrate neural tube.

03

List Functions and Differentiation

The mesoderm gives rise to a variety of connective tissues. It reorganizes into groups of cells called somites, which further develop into specific structures.

04

Analyze Each Option

Compare each provided option based on the description of mesoderm and its differentiation: a. This option mentions somites developing into facial cartilage, ribs, and lungs. b. This option includes segmental muscle and notochord among the tissues. c. This option is similar to (a) but adds segmental muscle and notochord. d. This option lists facial cartilage, ribs, and lungs, without mentioning the somites.

05

Select the Correct Option

Option (c) covers the correct location (alongside the neural tube) and the differentiation into ribs, lungs, somites, segmental muscle, and notochord.

Unlock Step-by-Step Solutions & Ace Your Exams!

• Full Textbook Solutions

  Get detailed explanations and key concepts

• Unlimited Al creation

  Al flashcards, explanations, exams and more...

• Ads-free access

  To over 500 millions flashcards

• Money-back guarantee

  We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

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

Primary Germ Layers

The foundation of all tissues and organs in the body starts with three primary germ layers formed during early embryonic development. These layers are the ectoderm, mesoderm, and endoderm. Each layer has its distinct future roles.

The mesoderm, our focus, lies between the ectoderm (outer layer) and the endoderm (inner layer). These layers collectively play a crucial role in shaping the embryo's body plan and initiating the development of various organs and tissues.

• Ectoderm: Forms structures such as skin and the nervous system.
• Endoderm: Gives rise to internal structures like the lining of the digestive tract.
• Mesoderm: Develops into muscles, bones, and the circulatory system, among other tissues.

Somites

Somites are blocks of mesoderm located on either side of the neural tube in a developing embryo. These segmented divisions appear in pairs and play a fundamental role in forming various structures.

Somites contribute to the development of:

• Vertebrae: The backbone bones derive from these segments.
• Ribs and Intercostal Muscles: Somites help form both the ribs and the muscles between them.
• Dermatome: This refers to the skin layers that somites differentiate into.
• Myotome: These are muscle tissues, aiding in the formation of skeletal muscles.
• Sclerotome: These components form the vertebral column and rib cartilage.

This segmentation process coordinates the complicated arrangement of the vertebrate body structure.

Connective Tissues

Connective tissues are essential for providing structure and support in the body. They arise from the mesoderm layer during embryonic development. There are various types of connective tissues, each with specific functions and characteristics.

Noteworthy connective tissues include:

• Bone: Provides a rigid framework for the body.
• Cartilage: Offers flexible support, found in joints, the rib cage, and ear structures.
• Adipose Tissue: Stores fat, essential for energy and insulation.
• Blood: A fluid tissue crucial for transporting nutrients and oxygen.

Connective tissues ensure proper physical support and facilitate numerous critical biological functions.

Vertebrate Development

Vertebrate development is a complex orchestrated process that transforms a single cell (the zygote) into a fully formed organism with a backbone. This development hinges on the proper differentiation and organization of the three primary germ layers.

Key stages in vertebrate development include:

• Fertilization: Fusion of sperm and egg to form a zygote.
• Cleavage: Rapid cell division without growth, forming a multicellular structure.
• Gastrulation: Formation of the three primary germ layers.
• Organogenesis: Development of organs from the germ layers.

A well-regulated process ensures that cells differentiate correctly, leading to the formation of organs such as the heart, lungs, and kidneys.

Neural Tube

The neural tube is an essential structure in the developing embryo that eventually forms the central nervous system, which includes the brain and spinal cord. Its correct formation is crucial for the embryo's overall development.

Formation and development of the neural tube involve:

• Neurulation: The process whereby the neural plate folds and forms the neural tube.
• Closure: The tube closes at both ends to form a continuous structure.
• Defects: Improper closure can lead to conditions like spina bifida or anencephaly.

Ensuring a fully formed and healthy neural tube is vital for developing the central nervous system and overall embryo viability.