Respiration Control and Gas Exchange Quiz
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Questions and Answers

Which of the following is true about the stimuli at the various receptors in respiration control?

  • Only concentration of CO2 is important stimulus
  • Only concentration of O2 is important stimulus
  • Concentrations of O2 and CO2 are not important stimuli
  • Concentrations of O2 and CO2 are important stimuli (correct)

What happens to the alveolar tensions during breath holding?

  • PO2 rises and PCO2 falls
  • PO2 falls and PCO2 rises (correct)
  • PO2 and PCO2 both rise
  • PO2 and PCO2 both fall

What is the primary factor for breaking during breath hold when breathing 100% O2?

  • Hypoxia
  • Hyperventilation
  • Hypercapnia (correct)
  • Lung collapse

Breathing 100% O2 increases the tolerance for hypercapnia because

<p>it removes both hypoxic and hypercapnic drives for respiration (A)</p> Signup and view all the answers

Hyperventilating while breathing 100% O2 followed by breath holding is dangerous because

<p>it decreases the volume of gas contained in the lungs (C)</p> Signup and view all the answers

The theoretical breath-hold time, based on the given information, is approximately

<p>19.84 minutes (C)</p> Signup and view all the answers

Breathing 100% O2 increases the tolerance for hypercapnia because

<p>the presence of nitrogen helps to provide a splint to keep the alveoli open (B)</p> Signup and view all the answers

What is the primary factor for breaking during breath hold when breathing 100% O2?

<p>Decrease in the volume of gas contained in the lungs (C)</p> Signup and view all the answers

What happens to the alveolar tensions during breath holding?

<p>The volume of gas contained in the lungs decreases (C)</p> Signup and view all the answers

What happens to the alveolar tensions during breath holding?

<p>PO2 will fall and PCO2 will rise (A)</p> Signup and view all the answers

What is the primary factor for breaking during breath hold when breathing 100% O2?

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

The theoretical breath-hold time, based on the given information, is approximately

<p>$47PX$ (C)</p> Signup and view all the answers

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