In humans, arterial PCO₂ is monitored carefully by breathing centers in the medulla, and any changes in it lead quickly to changes in respiratory rate.The actual stimulus that leads to increased respiratory gas exchange is/are

Question

Quizplus · Accepted Answer

Changes in arterial PCO2 (carbon dioxide) are the main stimulus for increased respiratory gas exchange. As CO2 levels increase, hydrogen ions are produced, which leads to a decrease in pH (acidosis). The chemoreceptors in the medulla detect this change in pH and signal for increased respiratory rate to eliminate CO2 and bring the pH back to normal. Therefore, hydrogen ions are the correct answer. Choices A, B, C, and E are not directly related to respiratory gas exchange stimulation.

In Humans, Arterial PCO2 Is Monitored Carefully by Breathing Centers

In Humans, Arterial PCO₂ Is Monitored Carefully by Breathing Centers