Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Chapter 30, Problem 12RQ
Summary Introduction
To describe: The happenings that take place during filtration, tubular reabsorption, and tubular secretion in the mammalian nephron.
Introduction: Unwanted toxic materials need to be excreted from the body. The process of removal of such unwanted toxic materials from the body is referred to as excretion. The urinary system plays an important role in excreting nitrogenous waste.
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Describe what happens during the following stages in urine forma-tion in the mammalian nephron: filtration, tubular reabsorption, tubular secretion.
Describe structure of the nephron. How is the mammalian nephron capable of creating concentrated urine? How does filtration take place?
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Chapter 30 Solutions
Loose Leaf For Integrated Principles Of Zoology
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- Describe (and label on a diagram) the structures of a nephron (including associated blood vessels) and give the functions of each structure.arrow_forwardAs the text noted, two-thirds of the water and solutes that the body reclaims by reabsorption in nephrons occurs in the proximal tubule. Proximal tubule cells have large numbers of mitochondria and demand a great deal of oxygen. Explain why.arrow_forwardMatch the structure of the nephron to its primary function. Renal corpuscle Proximal tubule Loop of Henle Distal tubule Collecting duct responsible for size-selective filtration of the blood responsible for active transport and reabsorption of ions and nutrients as well as the reabsorption of water may or may not reabsorb sodium ions depending on the presence or absence of the hormone aldosterone. establishes a strong osmotic gradient allowing the reabsorption of water, sodium ions, and chloride ions. regulates reabsorption of water in response to the presence of ADH & secretes urea into the interstitial fluid to maintain the osmotic gradient of the medulla.arrow_forward
- What would be the effect of a dysfunctional Na+/K+ pump in the cells of the following parts of the nephro:a. Proximal convoluted tubule?b. Loop of Henle?c. Distal convoluted tubule?arrow_forwardPlease define/describe the following 3 renal functions in mammals: filtration, reabsorption and secretion. Describe at least one location in the nephron where each of these functions takes place. How does each of these functions contribute to homeostasis of the organism?arrow_forwardNa+ ions are actively transported out of the tubules to help set up the countercurrent multiplier. Which of the following are sites of active Na+ ion transport in the nephron?arrow_forward
- Describe how and where water, organic compounds, and ions are reabsorbed in the nephron by both passive and active processes?arrow_forwardSeveral pharmacological agents have been shown to lower the pressure of the filtrate inside the lumen of nephrons. What affect will this have? a hydrostatic pressure of fluid in the Bowman’s capsule increases, GFR increases b hydrostatic pressure of fluid in the Bowman’s capsule decreases, GFR decreases c hydrostatic pressure of fluid in the Bowman’s capsule increases, GFR decreases d hydrostatic pressure of fluid in the Bowman’s capsule decreases, GFR increasesarrow_forwardNephron Describe the phsiology of the nephron. Explain the function of each structure and how the composition of the urine changes from the Bowmans capsule to the collecting duct. How does the function of nephron differ when the animal has an excess of water, as opposed to when it is dehydrated? How do hormones help regulate the physiology of the nephron? Why is the nephron so highly vascularized?arrow_forward
- Compare the transport of Na+, Cl−, and water across the walls of the proximal tubule, ascending and descending limbs of the nephron loop, and collecting duct.arrow_forwardAlthough the kidneys are probably best known as filtration organs, tubular reabsorption (the second step of urine formation in a nephron) actually reclaims molecules that have already been filtered from the blood. Describe the tubular reabsorption process, including the structures and molecules involved, and explain why these molecules need to be reabsorbed. please helparrow_forwardWhat is the difference between filtration and reabsorption? Explain how hydrostatic, osmotic (or colloid oncotic), and osmosis influence fluid transport across the nephron.arrow_forward
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