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What are the four diffusion paths that a molecule might follow as it travels through the root epidermis and cortex? Why does this diagram stop at the endodermis? What happens at the endodermis?

What are the four diffusion paths that a molecule might follow as it travels through the root epidermis and cortex? Why does this diagram stop at the endodermis? What happens at the endodermis?

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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1. Examine Figure 7-13. What are the four diffusion paths that a molecule might follow as it travels through the root epidermis and cortex? Why does this diagram stop at the endodermis? What happens at the endodermis?

Casparian strip Radial wall Transverse wall Outside of root Outside of root Cortex Inside of root Endodermis- (A) Endodermis (B) (C) FIGURE 7-13 (A) The endodermis is a cylinder, one layer of cells thick, each with Casparian strips. The
Transcribed Image Text:Casparian strip Radial wall Transverse wall Outside of root Outside of root Cortex Inside of root Endodermis- (A) Endodermis (B) (C) FIGURE 7-13 (A) The endodermis is a cylinder, one layer of cells thick, each with Casparian strips. The
FIGURE 7-13 (A) The endodermis is a cylinder, one layer of cells thick, each with Casparian strips. The best analogy is a brick chimney: It is a cylinder, one layer thick. The cement is analogous to the Casparian strips. (B) No apoplastic transport occurs across the endodermis. Materials that have been moving apoplastically (1) are stopped and can proceed farther only if the endodermis plasma membrane accepts them (2). Symplastic transport (3) is not affected. Plasma membranes that are impermeable to a particular type of molecule prevent that molecule from crossing the endodermis. (C) The endodermis in this corn is relatively easy to see: In all cells, Casparian strips are visible as red lines on the radial walls. In a few cells, only Casparian strips are present, but in many, the radial walls and inner tangential walls have started to thicken; it is unusual for this development to start so early (×200).
Transcribed Image Text:FIGURE 7-13 (A) The endodermis is a cylinder, one layer of cells thick, each with Casparian strips. The best analogy is a brick chimney: It is a cylinder, one layer thick. The cement is analogous to the Casparian strips. (B) No apoplastic transport occurs across the endodermis. Materials that have been moving apoplastically (1) are stopped and can proceed farther only if the endodermis plasma membrane accepts them (2). Symplastic transport (3) is not affected. Plasma membranes that are impermeable to a particular type of molecule prevent that molecule from crossing the endodermis. (C) The endodermis in this corn is relatively easy to see: In all cells, Casparian strips are visible as red lines on the radial walls. In a few cells, only Casparian strips are present, but in many, the radial walls and inner tangential walls have started to thicken; it is unusual for this development to start so early (×200).
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