THE CORONARY BLOOD VESSELS (THE FUEL LINES): HOW DO THE CORONARY ARTERIES ADJUST BLOOD FLOW? THE CORONARY VEINS

How Do the Coronary Arteries Adjust Blood Flow?

Blood flow through the coronary arteries is closely related to the amount of oxygen that the myocardial cells r at the moment. Therefore, in normal coronary arteries, blood flow increases as the demand for oxygen increases such as during exercise.

During exertion, when the heart beats faster and more vigorously, more oxygen is needed. To get more blood to the myocardium, the muscular layer of the arteries relaxes and allows the arteries to expand (get bigger), so more blood can flow through them. More blood can flow through a wide vessel than a small one in a given period, just as more water can flow through a wide pipe than a small one in a given period.

The Coronary Veins

Although you rarely hear about the coronary veins because they are unlikely to cause any problems, the blood that supplies the heart must be returned for a fresh supply of oxygen. Capillaries lead to coronary veins, which converge into larger and larger vessels and ultimately become the coronary sinus, which drains into the right atrium. Most of the blood returning from the myocardium of the left ventricle flows through the coronary sinus.

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Cardio & Blood-Сholesterol