ECOLOGY
EXCRETORY PRODUCTS AND THEIR ELIMINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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glucose
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urea
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uric acid
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H ion
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Detailed explanation-1: -Secreted substances largely include hydrogen, creatinine, ions, and other types of waste products, such as drugs. Tubular secretion is the transfer of materials from peritubular capillaries to the renal tubular lumen and occurs mainly by active transport and passive diffusion.
Detailed explanation-2: -The materials that are exuded into the tubular fluid for exclusion from the body include Potassium ions (K+), Hydrogen ions (H+), Ammonium ions (NH+), Creatinine, and Urea.
Detailed explanation-3: -In the convoluted distal tubule (early distal tubule), most H-ion secretion occurs by means of the Na+/H+ exchanger.
Detailed explanation-4: -In humans, and other vertebrates, tubular secretion occurs in the kidneys, where the blood is filtered in specialized structures known as nephrons.
Detailed explanation-5: -A Luminal H+ ATPase then secretes the newly generated H+ into the tubular lumen via primary active transport. The newly generated HCO3-molecule is transported past the basolateral membrane and into the extracellular fluid through a bicarbonate porter.