Yes, sometimes this is the case. In fact, collateral systems among the coronary arteries have been hypothesized to "save" individuals from heart attacks and even death, when the main coronary arteries are completely or almost completely blocked.
no
33510,33533
Diastole
You can find more information on Coronary bypass graft 2 venous and 1 arterial on ahrq.gov/research/findings/final-reports/ssi/ssiapd.html
33510,33533
33510,33533
Left coronary artery.
Aids
The arterial supply of the coronary circulation is provided by the right and left coronary arteries, both arising from the base of the aorta and encircling the heart in the coronary sulcus.
Left coronary artery
cause visually they look like branches
The left and right coronary arteries.