Editing Coronary circulation (section)

== Clinical significance ==
The [[blood vessel|vessels]] that deliver [[oxygen]]-rich [[blood]] to the [[myocardium]] are the [[coronary arteries]]. When the [[artery|arteries]] are healthy, they are capable of autoregulating themselves to maintain the coronary blood flow at levels appropriate to the needs of the [[myocardium|heart muscle]]. 

The relatively narrow coronary arteries are commonly affected by [[atherosclerosis]] and can become blocked, causing [[Angina pectoris|angina]] or a [[myocardial infarction|heart attack]]. The coronary arteries are classified as "terminal circulation", since they represent the only source of blood supply to the myocardium; there is very little redundant blood supply, that is why blockage of these vessels can be so critical.{{citation needed|date=April 2021}}