GENERAL ANATOMY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In reabsorption, the solutes are reabsorbed across the filtration membrane into the interstitial fluid by transport processes, such as active transport and cotransport.
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In secretion, solutes are secreted across the wall of the nephron into the filtrate.
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Filtration is the movement of materials across the wall of the nephron into Bowman’s capsule to form a filtrate.
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All statements need further evaluation.
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Detailed explanation-1: -Answer: C. In secretion, solutes are secreted across the wall of the nephron into the filtrate. C: In secretion, solutes are secreted across the wall of the nephron into the filtrate. A: Filtration is the movement of materials across the filtration membrane into Bowman’s capsule to form a filtrate.
Detailed explanation-2: -Most of the Ca++, Na+, glucose, and amino acids must be reabsorbed by the nephron to maintain homeostatic plasma concentrations. Other substances, such as urea, K+, ammonia (NH3), creatinine, and some drugs are secreted into the filtrate as waste products.
Detailed explanation-3: -The proximal tubule of the nephron-This is the correct answer. Secretion occurs in the proximal tubule section of the nephron and is responsible for the transport of certain molecules out of the blood and into the urine.
Detailed explanation-4: -Secretion takes place in following parts of nephron: Proximal convoluted tubule: A nitrogenous waste product i.e uric along with several organic acids are secreted in PCT.
Detailed explanation-5: -At the same time, waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion. The secreted ions combine with the remaining filtrate and become urine. The urine flows out of the nephron tubule into a collecting duct.