Ventilation is increased the most by:Group of answer choicesincreases in arterial PO2.increases in arterial PCO2.decreases in arterial PO2.decreases in arterial PCO2.
Question
Ventilation is increased the most by:Group of answer choicesincreases in arterial PO2.increases in arterial PCO2.decreases in arterial PO2.decreases in arterial PCO2.
Solution
Ventilation is increased the most by increases in arterial PCO2.
Here's why:
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The primary drive to breathe comes from the body's need to get rid of carbon dioxide (CO2), not to take in oxygen (O2).
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The body monitors levels of CO2 in the blood through chemoreceptors in the medulla oblongata of the brain.
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When arterial PCO2 levels increase (meaning there is more CO2 in the blood), these chemoreceptors signal the respiratory centers of the brain to increase the rate and depth of breathing.
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This increased ventilation helps to expel the excess CO2 from the body, bringing levels back to normal.
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While changes in arterial PO2 can also affect ventilation, the body is much more sensitive to changes in PCO2 levels. Therefore, increases in arterial PCO2 have the greatest effect on ventilation.
Similar Questions
8) Ventilation–perfusion inequalities lead to hypoxemia becausea) the relationship between PCO2 and the content of CO2 in blood is sigmoidal.b) a decrease in ventilation–perfusion matching in a lung region causes pulmonaryarteriolar vasodilation in that region.c) increases in ventilation cannot fully restore O2 content in areas with lowventilation–perfusion matching.d) increases in ventilation cannot normalize PCO2.e) pulmonary blood vessels are not sensitive to changes in PO2
6. An animal experiences an acid-base imbalance in the arterial blood that results in acidosis. Toincrease pH toward normal, which direction would the ventilation rate be changed and what wouldbe the corresponding change in arterial PCO2?A. Ventilation rate increases, arterial PCO2 increasesB. Ventilation rate increases, arterial PCO2 decreasesC. Ventilation rate decreases, arterial PCO2 increasesD. Ventilation rate decreases, arterial PCO2 decreasesE. None of the above
Which of the followig would increase the pH of the blood? high intensity exercise resulting in the production of CO2. decreased ventilation causing a build up of CO2. increased ventilation at the lung to remove CO2. a higher ventilation to perfusion ratio (V/Q) in the lung.
4) Which of the following will increase alveolar PO2?a) increase in metabolism and no change in alveolar ventilationb) breathing air with 15% oxygen at sea levelc) increase in alveolar ventilation matched by an increase in metabolismd) increased alveolar ventilation with no change in metabolisme) carbon monoxide poisoning
The major stimulus for increased ventilation during exercise is:Group of answer choicesCO2 flux to the lungincreased blood lactatehypoxia
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