An excessive discharge of cortical neuron activity is called:

Which of the following statements about chemoreceptors in the human body is true?

A) The central chemoreceptors are located in the lungs and provide the primary stimulus to breathe. B) The peripheral chemoreceptors are extremely sensitive to oxygen and are located in the brain. C) The central chemoreceptors constantly monitor the oxygen levels in the body and increase the rate when more O2 is needed. D) The peripheral chemoreceptors are more sensitive to oxygen than carbon dioxide.

Premature ventricular complexes (PVCs) that originate from different sites in the ventricle:

A) are called unifocal PVCs. B) produce a palpable pulse. C) are also called fusion PVCs. D) will appear differently on the ECG.