Blood flows from the right coronary artery into the
Pulmonary artery
Left anterior descending artery
Circumflex artery
Anterior interventricular artery
Right marginal artery
The Correct Answer is E
A. Pulmonary artery: The pulmonary artery originates from the right ventricle and is positioned anterior to the ascending aorta as it exits the heart. Its physiologic role is to transport deoxygenated blood to the lungs for oxygenation. It is part of the pulmonary circulation and does not arise from or receive blood flow from the right coronary artery, which supplies myocardium.
B. Left anterior descending artery: The left anterior descending artery, also known as the anterior interventricular artery, branches from the left coronary artery and runs within the anterior interventricular sulcus toward the apex. It supplies the anterior wall of the left ventricle and the anterior two-thirds of the interventricular septum.
C. Circumflex artery: The circumflex artery arises from the left coronary artery and courses in the left atrioventricular (coronary) sulcus. It supplies the lateral and posterior portions of the left ventricle and may contribute to left atrial perfusion. Its anatomical origin from the left coronary artery excludes it from being a branch of the right coronary artery.
D. Anterior interventricular artery: The anterior interventricular artery lies in the anterior interventricular groove between the right and left ventricles. It provides blood supply to the interventricular septum and the anterior surfaces of both ventricles. As a branch of the left coronary artery, it does not represent a continuation of blood flow from the right coronary artery.
E. Right marginal artery: The right marginal artery is a direct branch of the right coronary artery and travels along the acute margin of the heart toward the apex. It supplies the right ventricular free wall and contributes to perfusion of the right myocardium. Its anatomical course and origin confirm that blood flows from the right coronary artery into the right marginal artery.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Correct answer: True
The sinoatrial (SA) node, located in the upper wall of the right atrium near the entrance of the superior vena cava, serves as the heart’s natural pacemaker by generating electrical impulses. These impulses spread through specialized internodal pathways across the atrial walls, causing atrial depolarization and contraction. The impulses then converge at the atrioventricular (AV) node, situated in the lower interatrial septum near the tricuspid valve, which briefly delays the signal to allow the atria to empty completely into the ventricles. This pathway ensures coordinated atrial and ventricular contraction, maintaining efficient cardiac output.
Correct Answer is A
Explanation
Correct answer: True
Purkinje fibers are specialized conduction fibers located in the subendocardial layer of the ventricles, extending from the bundle branches to distribute impulses throughout the ventricular myocardium. Under normal conditions, they rapidly conduct impulses initiated by the SA node via the AV node to coordinate ventricular contraction. If the AV node is blocked, the Purkinje fibers can act as a backup pacemaker, generating spontaneous impulses at an intrinsic rate of approximately 30–40 beats per minute. This slower rate maintains minimal ventricular contraction, but it is insufficient to sustain adequate cardiac output for normal physiologic demands over extended periods.
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