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Below is a diagram of a placoid scale (a type of scale found on cartilaginous fish). a. What other structure, found in many vertebrates, does the scale resemble? b. What might this say about the origin of your answer in 6a?

Below is a diagram of a placoid scale (a type of scale found on cartilaginous fish). a. What other structure, found in many vertebrates, does the scale resemble? b. What might this say about the origin of your answer in 6a?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Below is a diagram of a placoid scale (a type of scale found on cartilaginous fish). a. What other structure, found in many vertebrates, does the scale resemble? b. What might this say about the origin of your answer in 6a?
**Transcription and Explanation of the Diagram** --- **Diagram Title**: Structure of Developing Tooth **Description**: - **Enameloid**: The outermost layer of the developing tooth, similar in composition to enamel, providing a protective surface. - **Dentin**: The dense, bony tissue forming the bulk of the tooth beneath the enameloid. It supports the structure and protects the pulp. - **Pulp**: The central part of the tooth, containing nerves and blood vessels, responsible for nourishing the tooth and forming dentin. - **Underlying Bone**: The bone that supports the developing tooth, providing stability and anchorage. - **Epidermis**: The outer epithelial layer covering the ectomesenchyme, involved in the early stage of tooth development. - **Ectomesenchyme**: A type of mesenchyme derived from neural crest cells that plays a crucial role in tooth development, influencing the formation of dentin and pulp. - **Dermis**: The inner layer of skin beneath the epidermis, providing structural support and elasticity. --- This diagram shows the anatomical relationships and components involved in the formation of a tooth, highlighting the developmental interaction between various tissues such as the enameloid, dentin, pulp, and underlying bone. Understanding these relationships is essential for comprehending the complexities of dental anatomy and development.
Transcribed Image Text:**Transcription and Explanation of the Diagram** --- **Diagram Title**: Structure of Developing Tooth **Description**: - **Enameloid**: The outermost layer of the developing tooth, similar in composition to enamel, providing a protective surface. - **Dentin**: The dense, bony tissue forming the bulk of the tooth beneath the enameloid. It supports the structure and protects the pulp. - **Pulp**: The central part of the tooth, containing nerves and blood vessels, responsible for nourishing the tooth and forming dentin. - **Underlying Bone**: The bone that supports the developing tooth, providing stability and anchorage. - **Epidermis**: The outer epithelial layer covering the ectomesenchyme, involved in the early stage of tooth development. - **Ectomesenchyme**: A type of mesenchyme derived from neural crest cells that plays a crucial role in tooth development, influencing the formation of dentin and pulp. - **Dermis**: The inner layer of skin beneath the epidermis, providing structural support and elasticity. --- This diagram shows the anatomical relationships and components involved in the formation of a tooth, highlighting the developmental interaction between various tissues such as the enameloid, dentin, pulp, and underlying bone. Understanding these relationships is essential for comprehending the complexities of dental anatomy and development.
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The study of life is as fascinating as life itself, regardless of whether the species we study walk on land, fly in the air, or swim in the sea. Marine biology comprises the organisms that live in the seven oceans.

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