In the context of coronary circulation, what is the significance of the right coronary artery?
It supplies the interventricular septum
It supplies the left ventricle
It supplies the right atrium and right ventricle
It supplies the left atrium
The Correct Answer is C
A. It supplies the interventricular septum:
The interventricular septum is mainly supplied by the left anterior descending (LAD) artery. The RCA contributes only partially via its posterior descending branch in some individuals (right-dominant circulation).
B. It supplies the left ventricle:
While the RCA can supply parts of the left ventricle inferiorly in some cases, the main supply to the left ventricle comes from the LAD and circumflex arteries.
C. It supplies the right atrium and right ventricle:
The RCA primarily supplies the right atrium, right ventricle, SA node, AV node, and part of the inferior left ventricle. This is crucial for maintaining right-sided function and conduction. Occlusion can lead to inferior MI and arrhythmias.
D. It supplies the left atrium:
The left atrium is mainly supplied by the circumflex artery, not the RCA. Misunderstanding this can affect predictions of infarct locations.
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Related Questions
Correct Answer is C
Explanation
A. Myocardium:
The myocardium is the muscular layer of the heart, not part of the pericardium.
B. Fibrous pericardium:
The fibrous pericardium is the outer tough layer that anchors the heart in the thorax; it is not directly attached to the heart muscle.
C. Serous pericardium (visceral layer):
The visceral layer of the serous pericardium, also called the epicardium, lies directly on the heart muscle, providing lubrication and a smooth interface between the heart and the pericardial cavity.
D. Parietal pericardium:
The parietal layer lines the inner surface of the fibrous pericardium but is separated from the myocardium by the pericardial cavity.
Correct Answer is B
Explanation
A. Activation of chemoreceptors:
Chemoreceptors respond to oxygen, carbon dioxide, and pH levels in the blood, affecting ventilation rather than fluid retention.
B. Activation of the renin-angiotensin-aldosterone system:
RAAS increases blood pressure by promoting sodium and water reabsorption in the kidneys, increasing blood volume, and by causing vasoconstriction, increasing systemic vascular resistance. This is a major mechanism in long-term blood pressure regulation.
C. Baroreceptor reflex:
Baroreceptors detect acute changes in blood pressure and adjust heart rate and vascular tone but do not directly control sodium and water retention.
D. Release of antidiuretic hormone:
ADH increases water reabsorption in the kidneys, but its effect on sodium retention is indirect and less significant compared to RAAS.
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