Which of the following is true?a. Peripheral chemoreceptors increase firing with low arterial PO2 but are not sensitive to an increase in arterial PCO2.b. The primary stimulus to the central chemoreceptors is low arterial PO2.c. Peripheral chemoreceptors increase firing during a metabolic alkalosis.d. The increase in ventilation during exercise is due to a decrease in arterial PO2.e. Peripheral and central chemoreceptors both increase firing when arterial PCO2 increases.

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