Kaplan Nursing Entrance Practice Exam

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What is the notochord?

An organ system in mammals
A supportive rod in chordate embryos
A type of muscle structure
An external protective covering

The correct answer is: A supportive rod in chordate embryos

The notochord is a key structure found in the embryos of chordates, which includes animals such as vertebrates. It serves as a supportive rod that runs along the length of the body and provides structural support during development. In many chordates, particularly in vertebrates, the notochord is replaced by the vertebral column (spine) as development progresses. However, in some organisms, it remains as a significant part of the body structure. Understanding the role of the notochord is essential for grasping the basic principles of chordate development and anatomy. Options relating to organ systems, muscle structures, and external coverings do not accurately describe the notochord’s biological function, which is specifically related to support and structural integrity during the early stages of development in embryonic forms.