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dentify the mechanism of transport used in this location across the simple cuboidal cell of the proximal convoluted tubule Choose from the following: (A) facilitated diffusion (B) simple diffusion (C) active transport (D) secondary active transport

dentify the mechanism of transport used in this location across the simple cuboidal cell of the proximal convoluted tubule Choose from the following: (A) facilitated diffusion (B) simple diffusion (C) active transport (D) secondary active transport

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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Identify the mechanism of transport used in this location across the simple cuboidal cell of the proximal convoluted tubule

Choose from the following:

(A) facilitated diffusion
(B) simple diffusion
(C) active transport
(D) secondary active transport
**Diagram Explanation: Amino Acid and Sodium Transport** This diagram depicts the mechanism of transport for amino acids across the intestinal brush border, highlighting the role of sodium ions (Na⁺) and energy in the form of ATP. - **Brush Border:** The top section labeled "brush border" represents the microvilli-covered surface of the intestinal epithelial cells, where nutrient absorption occurs. - **Amino Acid and Sodium Transport:** Amino acids are co-transported with sodium ions (Na⁺) across the membrane into the cell. This is indicated by the circular transport protein near the top of the diagram, outlined in a red square. - **Sodium-Potassium Pump (ATPase):** Beneath the brush border, there is an ATP-driven pump. This is shown by the directional arrows labeled "ATP," "ADP," and "Pᵢ" (inorganic phosphate), demonstrating ATP hydrolysis. This pump actively transports Na⁺ out of the cell and potassium ions (K⁺) into the cell. - **Ion Flow:** The arrows indicate the flow of Na⁺ into the cell with the amino acids at the top, and the exchange of Na⁺ out and K⁺ in at the bottom via the sodium-potassium pump. This system illustrates secondary active transport where the energy from ATP is used to maintain ion gradients, facilitating the intake of amino acids through symport with sodium ions.
Transcribed Image Text:**Diagram Explanation: Amino Acid and Sodium Transport** This diagram depicts the mechanism of transport for amino acids across the intestinal brush border, highlighting the role of sodium ions (Na⁺) and energy in the form of ATP. - **Brush Border:** The top section labeled "brush border" represents the microvilli-covered surface of the intestinal epithelial cells, where nutrient absorption occurs. - **Amino Acid and Sodium Transport:** Amino acids are co-transported with sodium ions (Na⁺) across the membrane into the cell. This is indicated by the circular transport protein near the top of the diagram, outlined in a red square. - **Sodium-Potassium Pump (ATPase):** Beneath the brush border, there is an ATP-driven pump. This is shown by the directional arrows labeled "ATP," "ADP," and "Pᵢ" (inorganic phosphate), demonstrating ATP hydrolysis. This pump actively transports Na⁺ out of the cell and potassium ions (K⁺) into the cell. - **Ion Flow:** The arrows indicate the flow of Na⁺ into the cell with the amino acids at the top, and the exchange of Na⁺ out and K⁺ in at the bottom via the sodium-potassium pump. This system illustrates secondary active transport where the energy from ATP is used to maintain ion gradients, facilitating the intake of amino acids through symport with sodium ions.
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