Respiratory Response to Increased CO2 Levels Quiz
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Questions and Answers

What effect does an increase in CO2 have on ventilation?

  • Has no effect on ventilation
  • Increases ventilation (correct)
  • Decreases ventilation
  • Stops ventilation
  • How does the response to increased CO2 change when the subject is asleep?

  • The response remains the same
  • The response is potentiated
  • The response stops
  • The response decreases (correct)
  • What happens to ventilation when CO2 levels drop below normal during sleep?

  • Ventilation decreases
  • Ventilation increases significantly
  • Ventilation remains the same
  • Ventilation stops (correct)
  • What stimulates a dramatic increase in ventilation when CO2 levels rise in the alveolar space?

    <p>Hypercapnia</p> Signup and view all the answers

    What is the effect of hypoxia on ventilation?

    <p>Increases ventilation</p> Signup and view all the answers

    How do we know that central chemoreceptors exist?

    <p>Because they sense CO2 changes</p> Signup and view all the answers

    What is the pKa value for Kir4.1?

    <p>6.0</p> Signup and view all the answers

    Which brain region is highlighted by orange areas as responding to focal acidification?

    <p>Cerebellum</p> Signup and view all the answers

    At what pH level does half inhibition occur for Kir2.3?

    <p>6.77</p> Signup and view all the answers

    Which site has been identified as a central chemoreceptor based on C-fos expression after exposure to high CO2 levels?

    <p>Ventrolateral medulla</p> Signup and view all the answers

    What is the Hill coefficient value for Kir1.1?

    <p>3.5</p> Signup and view all the answers

    Which brain area plays a critical role in rhythm generation and central chemoreception?

    <p>PreBötzinger Complex</p> Signup and view all the answers

    What is one of the possible mechanisms for central chemoreception mentioned in the text?

    <p>Release of neurotransmitters</p> Signup and view all the answers

    Which type of proteins detect pH changes and alter neuronal excitability?

    <p>Gap junctions</p> Signup and view all the answers

    What is the role of TASK channels in response to pH changes according to the text?

    <p>Conduct ions based on pH levels</p> Signup and view all the answers

    Which protein subtype is mentioned as a pH-sensitive membrane ion transport protein in the text?

    <p>Na+/H+ exchange protein subtype 3</p> Signup and view all the answers

    How do inward rectifier K+ channels (Kir) contribute to cellular excitability according to the text?

    <p>Regulating membrane potential based on CO2/pH levels</p> Signup and view all the answers

    In what type of studies were Kir2.3 currents recorded as per the text?

    <p>In-situ hybridization studies</p> Signup and view all the answers

    What does the 'CO2 response' refer to in the context of the text?

    <p>The absolute value of variables in 7% CO2 minus that in air</p> Signup and view all the answers

    What is the effect of IgG-SAP injections on the 'CO2 response' of ventilation according to the text?

    <p>No significant effect on ventilation</p> Signup and view all the answers

    What is suggested by the similarity of CO2 responses in NREM sleep and wakefulness?

    <p>RTN is a central chemoreceptor</p> Signup and view all the answers

    What does TPND represent in relation to CO2-activated neurons in-vivo?

    <p>Threshold for phrenic nerve discharge</p> Signup and view all the answers

    What is the purpose of acidifying RTN neurons during in-vivo recording as mentioned in the text?

    <p>To monitor cellular activity</p> Signup and view all the answers

    What neurotransmitter do CO2-sensitive RTN neurons contain?

    <p>Glutamate</p> Signup and view all the answers

    What type of response was observed in the XII motor output when CO2-acidified aCSF was microinjected into the NRo?

    <p>Increase</p> Signup and view all the answers

    In which region were CO2-sensitive serotonergic neurons found in the in-vitro slice preparations?

    <p>Raphe nuclei</p> Signup and view all the answers

    What method is mentioned as a powerful one for identifying central chemoreceptors in-vivo?

    <p>Focal acidification</p> Signup and view all the answers

    Where is the control region where CO2-acidified aCSF was microinjected in the lateral tegmental field?

    <p>Near PBC</p> Signup and view all the answers

    What did Richerson et al. find regarding the CO2 sensitivity of serotonergic neurons in-vitro?

    <p><strong>5-HT cells were central chemoreceptors</strong></p> Signup and view all the answers

    Which area showed no relevant response when CO2-acidified aCSF was microinjected according to the provided information?

    <p><strong>XII motor nuclei</strong></p> Signup and view all the answers

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