1.7 Acid-Base Regulation Quiz
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Questions and Answers

What happens when a molecule is bound with another molecule in the context of a buffer system?

  • The effects of the original molecule are enhanced.
  • The effects of the original molecule are removed. (correct)
  • The effects of the original molecule are amplified through the system.
  • The effects of both molecules are combined creating a new effect.

Why is the pH scale used instead of directly stating hydrogen ion concentration?

  • Because the concentration is always a simple integer.
  • To amplify slight changes in acidity or alkalinity.
  • To make hydrogen ion concentration compatible with other biological measurements.
  • To represent hydrogen ion concentrations with smaller numbers. (correct)

Which of the following best describes the action of a base in the context of acid-base regulation?

  • It neutralizes acidic solutions by adding hydroxide ions.
  • It donates hydrogen ions into a solution.
  • It converts hydrogen ions to water molecules.
  • It accepts hydrogen ions from a solution. (correct)

How does the respiratory system primarily contribute to acid-base regulation?

<p>By removing $CO_2$ which reduces carbonic acid levels. (A)</p> Signup and view all the answers

Which of the following can be described as the most powerful pH regulatory mechanism in the body?

<p>The kidneys. (A)</p> Signup and view all the answers

What reaction takes place when cellular metabolism produces $CO_2$ in regards to acid base regulation?

<p>It combines with water to form carbonic acid, which lowers the pH. (B)</p> Signup and view all the answers

What is the primary function of a buffer in maintaining pH levels?

<p>To reversibly bind with hydrogen ions, minimizing pH changes. (D)</p> Signup and view all the answers

What is the normal range of intracellular pH, according to the text?

<p>Between 6 and 7.4 (B)</p> Signup and view all the answers

According to the principles of reversible reactions, what happens when a reactant is added?

<p>It drives the reaction in the opposite direction. (B)</p> Signup and view all the answers

What is the primary role of carbonic anhydrase in the bicarbonate buffer system?

<p>To catalyze the combination of CO2 and H2O to form carbonic acid. (C)</p> Signup and view all the answers

In the bicarbonate buffer system, if more hydrogen is added, what direction will the reaction be driven?

<p>Towards CO2 and H2O. (D)</p> Signup and view all the answers

Which organs primarily regulate the amount of bicarbonate and CO2 in the body?

<p>The kidneys and the lungs. (C)</p> Signup and view all the answers

Why are proteins considered plentiful buffers in the body?

<p>Because of their high concentration and binding properties. (B)</p> Signup and view all the answers

How is CO2 primarily eliminated from the extracellular fluid?

<p>By ventilation via the lungs. (A)</p> Signup and view all the answers

Where in the renal tubules does most of the reabsorption of bicarbonate and secretion of hydrogen occur?

<p>The proximal tubule. (B)</p> Signup and view all the answers

Why can't bicarbonate ions be directly reabsorbed in the renal tubules?

<p>They don't readily diffuse through the lipid bilayer or cell walls. (B)</p> Signup and view all the answers

How is the reabsorption of bicarbonate facilitated in the renal tubules?

<p>By combining with hydrogen to form carbonic acid, which then diffuses as CO2 and H2O. (D)</p> Signup and view all the answers

What is the function of hydrogen secretion by the tubular epithelium?

<p>To increase the amount of bicarbonate reabsorption. (D)</p> Signup and view all the answers

What process is primarily responsible for severe respiratory alkalosis?

<p>Excessive ventilation. (A)</p> Signup and view all the answers

Which of the following can cause metabolic acidosis?

<p>Severe diarrhea. (A)</p> Signup and view all the answers

What is one mechanism by which diuretics can cause metabolic alkalosis?

<p>By increasing hydrogen secretion and bicarbonate reabsorption. (D)</p> Signup and view all the answers

What does a base excess indicate in acid base balance?

<p>An excess of bicarbonate ions. (D)</p> Signup and view all the answers

What is the normal range for the anion gap measure?

<p>8 to 16 (B)</p> Signup and view all the answers

Flashcards

pH

A measure of the acidity or alkalinity of a solution, based on the concentration of hydrogen ions (H+).

Acid

A substance that can donate hydrogen ions (H+).

Base

A substance that can accept hydrogen ions (H+).

Acid-Base Regulation

The process of maintaining a stable internal environment, particularly the pH of bodily fluids.

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Buffer

A substance that can bind to hydrogen ions (H+) and release them reversibly, helping to maintain a stable pH.

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Bicarbonate Buffer System

The primary buffering system in the body, involving bicarbonate ions (HCO3-) and carbonic acid (H2CO3).

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Respiratory System (Acid-Base Regulation)

A mechanism for regulating pH by removing carbon dioxide (CO2) from the body.

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Kidney (Acid-Base Regulation)

A mechanism for regulating pH by adjusting the excretion of acids or bases in urine.

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Le Chatelier's Principle

Adding a reactant to a reversible reaction shifts the equilibrium towards the opposite direction.

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Buffer Capacity

A solution's resistance to changes in pH.

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Carbonic Anhydrase

An enzyme that speeds up the conversion of CO2 and H2O to carbonic acid.

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Respiratory Regulation of pH

The lungs regulate the amount of CO2 in the blood.

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Renal Regulation of pH

The kidneys regulate the amount of bicarbonate in the blood.

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Respiratory Acidosis

A type of acid-base imbalance caused by excessive CO2 in the blood.

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Respiratory Alkalosis

A type of acid-base imbalance caused by excessive loss of CO2 from the blood.

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Metabolic Acidosis

A type of acid-base imbalance caused by excessive acid or loss of bicarbonate.

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Metabolic Alkalosis

A type of acid-base imbalance caused by excessive bicarbonate or loss of acid.

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Anion Gap

The difference between the measured positively charged cations and negatively charged anions in the blood.

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Base Excess

A measure of the amount of base needed to bring the blood pH to normal.

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Hydrogen ATPase

A primary active transport protein that pumps hydrogen ions out of the renal tubules.

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Hydrogen-Potassium Countertransporter

A protein in the renal tubules that exchanges hydrogen ions for potassium ions.

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Bicarbonate Reabsorption and Hydrogen Secretion

The process of reabsorbing bicarbonate and excreting hydrogen in the kidneys.

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Study Notes

Acid-Base Regulation

  • Body's enzyme systems are highly sensitive to hydrogen ion concentration, impacting numerous bodily functions.
  • Normal hydrogen ion concentration is critically low (e.g., sodium levels are millions of times greater).
  • Substances donating hydrogen are 'acids', while those accepting hydrogen are 'bases'.
  • Hemoglobin and red blood cells are significant bodily bases.
  • Weak acids/bases, not strong ones, are primarily discussed in these notes.
  • Dissociation constant (k) relates acid concentration to dissociated ions.
  • pH scale (negative log of hydrogen ion concentration) simplifies dealing with very small numbers.
  • Arterial pH is typically 7.4, while venous pH is around 7.35.
  • Cellular metabolism generates CO2, forming carbonic acid, reducing pH.

Acid-Base Regulation Systems

  • Three main systems regulate hydrogen concentration:
    • Chemical buffer system (acts quickly, in seconds)
    • Respiratory system (acts within minutes, controlling CO2 removal)
    • Renal system (acts over hours/days, the most potent system)
  • A buffer reversibly binds hydrogen, neutralizing its effect (example: drugs).
  • Le Chatelier's principle suggests adding a reactant drives the reaction to the opposite direction.
  • Bicarbonate buffer system (CO2 + H2O ↔ carbonic acid ↔ hydrogen ions + bicarbonate).
  • Carbonic anhydrase accelerates the CO2-to-carbonic acid reaction.
  • Kidneys regulate bicarbonate levels; respiration regulates CO2 levels.
  • Proteins are crucial body buffers due to their abundance and ability to bind hydrogen.

Acid-Base Regulation in Extracellular Fluid

  • Controlling extracellular fluid CO2 is crucial (excreted through ventilation).
  • CO2 is continually produced by cellular metabolism.
  • Alveolar ventilation rate is affected by hydrogen ion concentration.

Acid-Base Regulation in the Renal System

  • Hydrogen and bicarbonate continuously filter into renal tubules.
  • Bicarbonate reabsorption and hydrogen secretion in renal tubules regulate pH.
  • Bicarbonate isn't directly reabsorbed; it combines with hydrogen to form carbonic acid, which dissociates into CO2 and H2O.
  • CO2 diffuses readily and recombines to form carbonic acid, generating bicarbonate and hydrogen, and then both are reabsorbed through transporters.
  • Hydrogen is actively secreted into the tubular fluid, significantly increasing its concentration.

Acid-Base Regulation (cont'd)

  • Phosphate and ammonia are also important renal buffers.
  • Acidosis (low pH) is due to impaired respiratory centers or conditions increasing CO2 elimination; alkalosis (high pH) occurs from excessive ventilation.
  • Metabolic acidosis is from causes besides excessive CO2 (diarrhea is common).
  • Metabolic alkalosis results from bicarbonate retention or hydrogen loss.
  • Diagnosis involves assessing pH, plasma bicarbonate concentration, and CO2 concentration.

Acid-Base Regulation (cont'd)

  • Base excess/deficit is the measure of bicarbonate above/below normal ranges. Base excess/deficit is a better indicator of physiologic state than vital signs; it can predict transfusion needs.
  • More detailed study regarding acid-base disorders will be covered in class.

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Description

Test your knowledge on the body's acid-base regulation mechanisms. This quiz covers critical concepts such as pH levels, buffer systems, and the role of hemoglobin in maintaining hydrogen ion concentration. Understand the balance between acids and bases in your body and their impact on physiological functions.

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