16 Questions
Which vessel originates from the left sinus of Valsalva?
Left main coronary artery (LMCA)
What does the right coronary artery primarily supply?
Right ventricle and posterior septum
Which vessel typically supplies the lateral wall of the left ventricle?
Circumflex coronary artery (Cx)
What is the principal mechanism of metabolic regulation for coronary resistance?
Endothelial regulation
Which factor directly affects coronary blood flow according to the text?
Coronary resistance
What is responsible for autoregulation of coronary resistance?
Myogenic factors
In clinical terms, how many coronary arteries are typically considered despite actual anatomical distinctions?
Three
Where does the right coronary artery originate from?
Right cusp of the aortic valve
During which phase of the cardiac cycle is coronary flow to the left ventricle almost entirely diastolic?
Systole
What happens to myocardial flow during systole?
Falls close to zero
Which vessels are categorized as resistance vessels in the context of coronary circulation?
Arterioles and capillaries
What structures can dramatically change their diameter to regulate the flow through coronary capillaries?
Precapillary sphincters
What is the approximate ratio of capillaries to myocytes in the rich network of capillaries in the heart?
1:1
In pathological narrowing of epicardial conductance arteries, what happens to the endocardial flow in comparison to the epicardial flow?
Decreases
Which structure eventually empties into the right atrium after receiving coronary veins along with the SA and AV nodes?
Great cardiac vein
What can dramatically change their diameter in response to numerous stimuli to regulate the flow through coronary capillaries?
Arterioles
This quiz covers the factors influencing myocardial oxygen supply, including coronary blood flow, perfusion gradient, resistance, coronary O2 content, and availability. Topics include metabolic, endothelial, neurogenic, and myogenic mechanisms, as well as stenoses and conductance vessels.
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