Concerning the peripheral chemoreceptors, True is:
The peripheral chemoreceptors are responsive to the aerial PO2 , but during normoxia, the response is small. The other choices are incorrect. Peripheral chemoreceptors do respond to changes in blood pH, the response to changes in PCO2 is faster than is the case for central chemoreceptors, the central chemoreceptors are more impoant than the peripheral chemoreceptors in the ventilatory response to increased CO2, and peripheral chemoreceptors have a very high blood flow in relation to their mass.