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Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis
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All textbooksErin C. Amerman 2nd EditionCh. 25 Fluid, Electrolyte, and Acid-Base HomeostasisProblem 25.11a

Chapter 25, Problem 25.11a

The biggest source of metabolic acids in the body is:


a. lactic acid.

b. ketone bodies.

c. carbon dioxide.

d. uric acid.

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Hey, everyone. Let's take a look at this question together. When does lactic acid become a source of metabolic acid? Is it answer choice? A when cellular respiration occurs, answer choice B when an individual has diabetes, answer choice, C when fatty acids are metabolized or answer choice D when oxygen availability is limited, let's work this problem out together to try to figure out which of the following answer. Choices best explains when lactic acid becomes a source of metabolic acid. So in order to solve this question, we have to recall what we have learned about lactic acid and when lactic acid is formed to determine which of the following answer choices best explains when it becomes a source of metabolic acid. And we can recall that in relation to cellular respiration, we know that during normal respiration, which is respiration. When we have sufficient oxygen availability, glucose is broken down to produce energy, carbon dioxide and water. However, since this normal respiration requires sufficient oxygen. In cases when we have insufficient levels of oxygen, our cells resort to anaerobic metabolism. And we know that in anaerobic metabolism, glucose is metabolized into pyruvate. However, we know that this pyruvate cannot enter the mitochondria for further oxidation in the absence of oxygen. So pyruvate is instead converted to lactic acid or lactate in the cytoplasm regenerating N AD plus to sustain glycolysis. Therefore, lactic acid becomes a source of metabolic acid when we have insufficient levels of oxygen where our cells resort to anaerobic metabolism. So looking at our answer choices, we can identify answer choice d when oxygen availability is limited is the correct answer. Since that limited availability of oxygen is when lactic acid becomes a source of metabolic acid. And all other answer choices are incorrect. I hope you found this video to be helpful. Thank you and goodbye.
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