Blood Gases Lecture 6

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Questions and Answers

What is the primary requirement for normal cell metabolism?

  • Maintenance of blood oxygen within wide limits
  • Maintenance of blood pH within very narrow limits (correct)
  • Maintenance of blood oxygen within very narrow limits
  • Maintenance of blood pH within wide limits

What is the acceptable pH range for blood?

  • 7.70-7.80
  • 7.35-7.45 (correct)
  • 7.50-7.60
  • 7.20-7.30

What would be the consequence of not maintaining the narrow pH range?

  • Normal cell metabolism would occur
  • Cell death would occur
  • Abnormal cell metabolism would occur (correct)
  • Cell growth would accelerate

What is the relationship between blood pH and normal cell metabolism?

<p>Blood pH affects normal cell metabolism (C)</p> Signup and view all the answers

What is the clinical significance of blood pH regulation?

<p>It is crucial for normal cell metabolism (B)</p> Signup and view all the answers

What happens to a small proportion of carbon dioxide in blood plasma?

<p>It dissolves and is transported to the lungs unchanged (A)</p> Signup and view all the answers

What is the primary location where carbon dioxide combines with water to form carbonic acid?

<p>In the red cells (D)</p> Signup and view all the answers

What is the direction of carbon dioxide diffusion out of tissue cells?

<p>From tissue cells to surrounding capillary blood (D)</p> Signup and view all the answers

What is the primary form in which carbon dioxide is transported to the lungs?

<p>In dissolved form in plasma (D)</p> Signup and view all the answers

What is the process by which carbon dioxide moves out of tissue cells?

<p>Diffusion (D)</p> Signup and view all the answers

What happens to hydrogen ions as hemoglobin takes up oxygen from inspired air?

<p>They are decreased (C)</p> Signup and view all the answers

What is the location of the process where hydrogen ions are displaced from hemoglobin?

<p>The lungs (D)</p> Signup and view all the answers

What is the molecule involved in the process of oxygen uptake and hydrogen ion displacement in the lungs?

<p>Hemoglobin (D)</p> Signup and view all the answers

What is the direction of the reaction in the lungs compared to the rest of the body?

<p>The opposite (B)</p> Signup and view all the answers

What is inspired during the process of oxygen uptake in the lungs?

<p>Oxygen (D)</p> Signup and view all the answers

What is the primary buffer system in blood?

<p>Carbonic acid and bicarbonate (D)</p> Signup and view all the answers

What happens when a strong acid, like HCl, is added to the bicarbonate buffer?

<p>The acid dissociates, releasing hydrogen ions (B)</p> Signup and view all the answers

What is the purpose of the bicarbonate buffer system in blood?

<p>To maintain a constant pH in the blood (A)</p> Signup and view all the answers

What is the conjugate base of carbonic acid in the bicarbonate buffer system?

<p>Bicarbonate (A)</p> Signup and view all the answers

What is the result of the reaction between the bicarbonate buffer and the added strong acid?

<p>Formation of carbon dioxide and hydrogen ions (D)</p> Signup and view all the answers

What happens to the bicarbonate ions in the process of pH regulation?

<p>They are reabsorbed into the blood (A)</p> Signup and view all the answers

What is the fate of the hydrogen ions in the process of pH regulation?

<p>They pass into the lumen of the tubule and are eliminated from the body in urine (D)</p> Signup and view all the answers

What is the end product of carbonic acid dissociation in the process of pH regulation?

<p>Bicarbonate and hydrogen ions (C)</p> Signup and view all the answers

What is the role of the kidney in the process of pH regulation?

<p>To eliminate hydrogen ions from the body (C)</p> Signup and view all the answers

What is the purpose of the process of pH regulation?

<p>To maintain a stable pH level (A)</p> Signup and view all the answers

What triggers increased ventilation in the body?

<p>Increases in carbon dioxide concentration in the blood (D)</p> Signup and view all the answers

What is the direction of carbon dioxide diffusion in the lungs?

<p>From red cells to alveoli (A)</p> Signup and view all the answers

What is monitored by respiratory chemoreceptors in the brain stem?

<p>Carbon dioxide concentration in the blood (C)</p> Signup and view all the answers

What is the response of the body to an increase in carbon dioxide concentration in the blood?

<p>Increased ventilation (D)</p> Signup and view all the answers

What happens when carbon dioxide concentration in the blood decreases?

<p>Ventilation decreases (B)</p> Signup and view all the answers

Where do respiratory chemoreceptors respond to changes in carbon dioxide concentration?

<p>In the brain stem (A)</p> Signup and view all the answers

What is the outcome of the process of expiration in the lungs?

<p>Carbon dioxide is excreted in expired air (A)</p> Signup and view all the answers

What is the primary fate of bicarbonate ions in the process of pH regulation?

<p>They are reabsorbed into the blood (C)</p> Signup and view all the answers

What is the result of carbonic acid dissociation in the process of pH regulation?

<p>Formation of bicarbonate and hydrogen ions (A)</p> Signup and view all the answers

What is the role of the kidneys in the process of pH regulation?

<p>To eliminate hydrogen ions from the body (C)</p> Signup and view all the answers

What happens to hydrogen ions in the process of pH regulation?

<p>They are eliminated from the body in urine (B)</p> Signup and view all the answers

What is the primary purpose of the bicarbonate buffer system in blood?

<p>To maintain the body's pH balance (D)</p> Signup and view all the answers

What is the outcome of the dissociation of carbonic acid in the process of pH regulation?

<p>Formation of bicarbonate and hydrogen ions (A)</p> Signup and view all the answers

What is the fate of hydrogen ions in the kidneys?

<p>They are eliminated from the body in urine (D)</p> Signup and view all the answers

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