Final answer:
Coronary artery response to hypoxemia is an example of endogenous regulators of coronary blood flow, which involves the dilation of coronary arteries to increase blood flow and provide more oxygen to the heart.
Step-by-step explanation:
The example of endogenous regulators of coronary blood flow in the given options is the coronary artery response to hypoxemia. Endogenous regulators refer to internal factors that regulate blood flow within the heart itself. In response to hypoxemia, which is a deficient level of oxygen in the blood, coronary arteries naturally dilate to increase blood flow and oxygen supply to the heart muscle. This is part of the autoregulatory mechanism that maintains tissue perfusion under varying conditions. The autoregulation of coronary blood flow is a vital aspect of cardiovascular function, adjusting for fluctuations in blood pressure and metabolic activity within heart tissues.