Blood pH Regulation

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Questions and Answers

What is the result of increased H+, PCO2, and BPG in blood?

  • Decrease in hemoglobin affinity for O2 (correct)
  • Increase in hemoglobin affinity for O2
  • No effect on hemoglobin affinity for O2
  • Complete blockage of O2 transport

What happens to hemoglobin's affinity for oxygen at decreased temperatures?

  • It decreases
  • It increases (correct)
  • It remains the same
  • It becomes zero

What is the effect of heat production on hemoglobin's affinity for oxygen?

  • It becomes zero
  • It decreases (correct)
  • It remains the same
  • It increases

What is the result of inadequate O2 delivery to tissues?

<p>Hypoxia (C)</p> Signup and view all the answers

What percentage of carbon dioxide is transported dissolved in plasma?

<p>7-10% (D)</p> Signup and view all the answers

What is the result of decreased pH on hemoglobin-O2 bond?

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

What is the term for the shift of the O2-hemoglobin dissociation curve to the right?

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

What is the primary site of carbon dioxide transport in the blood?

<p>Red blood cells (D)</p> Signup and view all the answers

What happens to the pH of blood when there is slow shallow breathing?

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

What is the role of bicarbonate ions in the plasma?

<p>They act as a buffer to control blood pH (D)</p> Signup and view all the answers

What happens to carbon dioxide in the lungs?

<p>It dissociates from carbaminohemoglobin and is exhaled (D)</p> Signup and view all the answers

What is the result of the chloride shift in the lungs?

<p>Bicarbonate ions diffuse back into the red blood cell, and chloride ions diffuse out of the red blood cell (A)</p> Signup and view all the answers

What is the role of carbonic anhydrase in the transport of carbon dioxide?

<p>It catalyzes the breakdown of carbonic acid into carbon dioxide and water (A)</p> Signup and view all the answers

What happens to the hydrogen ions in the red blood cell in the lungs?

<p>They are released from hemoglobin and combine with bicarbonate ions (C)</p> Signup and view all the answers

At what point does arterial PO2 need to drop for peripheral chemoreceptors to respond?

<p>Below 60 mm Hg (C)</p> Signup and view all the answers

What triggers peripheral chemoreceptors to send nerve impulses to respiratory centers despite normal PCO2?

<p>Low PO2 (B)</p> Signup and view all the answers

What is the effect of hyperventilation on PCO2 levels?

<p>Lowers PCO2 (B)</p> Signup and view all the answers

How does a decrease in PCO2 during hyperventilation affect pH?

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

What is the effect on peripheral chemoreceptors when pH is high?

<p>Send fewer impulses to respiratory centers (C)</p> Signup and view all the answers

How does hyperventilation initially affect breathing rate and depth?

<p>Increases breathing rate and depth (A)</p> Signup and view all the answers

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