Biology: Concepts and Investigations
Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Chapter 33, Problem 5MCQ
Summary Introduction

Introduction:

The process of filtration, reabsorption, and secretion are the parts of urine formation, which occurs in kidneys. The useful materials are retained by the body and the toxic substances are excreted out of the body in the form of urine, which is known as excretion.

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Water moves out of the filtrate of the descending limb of the nephronloop becausea. there is a high concentration of solutes in the surrounding fluid.b. the cells of the descending limb are permeable to ions.c. the difference in the diameter of the arterioles creates a pressuregradient.d. there is a high concentration of solutes in the descending limb.
The function unique to the nephron loop is to a. regulate pH. b. excrete water. c. establish a concentration gradient in the medulla interstitial fluid. d. regulate the concentration of blood Ca2+.
Na+ 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? Select one: a. Thin ascending limb of the loop of Henle, distal tubule b. Thick ascending limb of the loop of Henle, collecting duct c. Thin ascending limb of the loop of Henle, thick ascending limb of the loop of Henle d. Collecting duct, descending limb of the loop of Henle e. Proximal tubule, thick ascending limb of the loop of Henle
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