Q:

The respiratory centre of the brain controls the respiratory muscles. Which of the following does NOT happen?

waelhammad
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2022-10-19
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The respiratory centre of the brain controls the respiratory muscles. Which of the following does NOT happen?

  1. An increase in carbon dioxide blood concentration stimulates peripheral chemoreceptors to signal the respiratory centre.
  2. A decrease in blood pH stimulates peripheral chemoreceptors to signal the respiratory centre.
  3. Hydronium ions cross the blood-brain barrier to directly stimulate the central chemoreceptors of the respiratory centre.
  4. A decrease in oxygen blood concentration stimulates peripheral chemoreceptors to signal the respiratory centre.
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waelhammad
2022-10-19
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C: Hydronium ions cannot cross the BBB. Carbon dioxide does and forms hydronium ions which go on to stimulate the central chemoreceptors as the CSF has no buffer to remove them. 

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