The Bundle of His splits into which structures?
Left and right atria
Left and right ventricles
Purkinje fibers
Left and right bundle branches
The Correct Answer is D
A. Left and right atria: The left and right atria receive blood from the pulmonary veins and the venae cavae, respectively. Electrical conduction to the atria originates from the sinoatrial node and spreads through atrial myocardium via internodal pathways. The Bundle of His does not divide into atrial structures, as it functions within the ventricular conduction system.
B. Left and right ventricles: Although the Bundle of His ultimately conducts impulses that stimulate ventricular contraction, it does not anatomically split into the ventricles themselves. Instead, it divides into specialized conduction pathways that distribute impulses within ventricular myocardium.
C. Purkinje fibers: Purkinje fibers are specialized subendocardial conducting fibers located along the inner walls of the ventricles. They arise distally from the bundle branches and rapidly transmit electrical impulses to ventricular myocardial cells to coordinate contraction. The Bundle of His does not split directly into Purkinje fibers but first divides into bundle branches.
D. Left and right bundle branches: The Bundle of His, located in the interventricular septum, divides into the left and right bundle branches. These branches descend along either side of the septum toward the apex of the heart. They conduct electrical impulses from the atrioventricular node to both ventricles, ensuring synchronized ventricular depolarization before distribution to Purkinje fibers.
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Related Questions
Correct Answer is {"dropdown-group-1":"B"}
Explanation
A. the same number of: Myocardial conducting cells do not have the same density of myofibrils as contractile cells. While they contain some contractile proteins, their primary function is impulse conduction rather than force generation, so their myofibril content is significantly lower.
B. fewer: Myocardial conducting cells, including those in the sinoatrial node, atrioventricular node, and Bundle of His, have fewer myofibrils compared to contractile cardiomyocytes. This structural adaptation allows them to focus on rapid generation and conduction of electrical impulses rather than strong contraction.
C. no: Conducting cells are not completely devoid of myofibrils. They retain some actin and myosin filaments, enabling minor contractile activity, but this is minimal compared to contractile myocardial cells.
D. more: Conducting cells do not require additional myofibrils, as their primary role is impulse initiation and propagation, not forceful contraction. Excess filaments would impede their conduction efficiency and slow electrical signal transmission.
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Left coronary
The left coronary artery arises from the left side of the ascending aorta, just above the aortic valve, and quickly branches to supply the heart muscle. Its two main branches are the anterior interventricular artery (also called the left anterior descending artery), which runs along the interventricular groove supplying the anterior walls of both ventricles, and the circumflex artery, which curves around the left side of the heart to supply the lateral and posterior walls of the left ventricle and left atrium. This anatomical arrangement ensures that oxygen-rich blood from the aorta is delivered efficiently to the majority of the left heart myocardium.
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