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Which of the following forms of the developing kidney is the first to filter the blood? (A) pronephros (B) mesonephros (C) metanephros

Which of the following forms of the developing kidney is the first to filter the blood? (A) pronephros (B) mesonephros (C) metanephros

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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Which of the following forms of the developing kidney is the first to filter the blood?

(A) pronephros
(B) mesonephros
(C) metanephros
This diagram illustrates the development of the urinary system, focusing on the progression from nephrotomes to the formation of the mesonephric duct and ureteric bud. 1. **Left Section**: - **Nephrotomes**: These segmented structures indicate the initial formation stages of the renal system. - **Primary Nephric Duct**: This duct serves as the foundational structure that progresses caudally towards the cloaca, denoted by a dashed arrow. 2. **Middle Section**: - As development proceeds, **mesonephric tubules** connect to the mesonephric duct, which is fully formed. - The **primary nephric duct** transitions to a **mesonephric duct**, with the degeneration of nephrotomes illustrated by fragmented lines. - **Uninduced Intermediate Mesoderm**: Remains present, indicating tissue that has not differentiated into renal structures. 3. **Right Section**: - The mesonephric duct persists alongside the developing gonad. - The **Metanephogenic Blastema** is highlighted, marking the beginning of permanent kidney formation. - The **Ureteric Bud** emerges from the duct, which is pivotal in the development of the definitive kidney structure. Arrows emphasize the direction of development and transformation through these stages.
Transcribed Image Text:This diagram illustrates the development of the urinary system, focusing on the progression from nephrotomes to the formation of the mesonephric duct and ureteric bud. 1. **Left Section**: - **Nephrotomes**: These segmented structures indicate the initial formation stages of the renal system. - **Primary Nephric Duct**: This duct serves as the foundational structure that progresses caudally towards the cloaca, denoted by a dashed arrow. 2. **Middle Section**: - As development proceeds, **mesonephric tubules** connect to the mesonephric duct, which is fully formed. - The **primary nephric duct** transitions to a **mesonephric duct**, with the degeneration of nephrotomes illustrated by fragmented lines. - **Uninduced Intermediate Mesoderm**: Remains present, indicating tissue that has not differentiated into renal structures. 3. **Right Section**: - The mesonephric duct persists alongside the developing gonad. - The **Metanephogenic Blastema** is highlighted, marking the beginning of permanent kidney formation. - The **Ureteric Bud** emerges from the duct, which is pivotal in the development of the definitive kidney structure. Arrows emphasize the direction of development and transformation through these stages.
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