After traveling through the AV node, an electrical impulse travel to which of the following components of an effective cardiac conduction system?
Purkinje fibers
Bundle of His
Bundle branches
SA node
The Correct Answer is B
a. Purkinje fibers: Purkinje fibers are the last structures to receive the signal within the ventricles, causing them to contract.
b. Bundle of His: The correct sequence of the cardiac conduction system is as follows: The electrical impulse originates in the sinoatrial (SA) node, then travels to the atrioventricular (AV) node. From the AV node, the impulse travels to the Bundle of His. After the Bundle of His, the impulse travels through the bundle branches and finally reaches the Purkinje fibers, which facilitate the contraction of the ventricles.
c. Bundle branches: The electrical impulse for heartbeat originates in the SA node (sinoatrial node). It then travels to the AV node (atrioventricular node), which delays the signal before sending it to the Bundle of His. The Bundle of His splits into right and left bundle branches, which distribute the electrical signal to the Purkinje fibers in the ventricles, causing them to contract in a coordinated fashion.
d. SA node: The SA node initiates the electrical impulse, not receive it after the AV node.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
a. Neutral feedback: This term is not typically used in the context of endocrine regulation.
b. Stimulating feedback: This is not a standard term in endocrine homeostasis mechanisms.
c. Negative feedback: Correct. Negative feedback is the primary mechanism by which endocrine systems maintain homeostasis. It involves reducing the output or activity of any organ or system back to its normal range of functioning.
d. Positive feedback: Positive feedback amplifies changes rather than stabilizing them, and is less common in maintaining homeostasis
Correct Answer is B
Explanation
a. Left phrenic artery: The left phrenic artery arises from the abdominal aorta, not the ascending aorta. It supplies blood to the diaphragm.
b. Left coronary artery: The ascending aorta is the first section of the aorta, the major artery leaving the heart. It branches out to give rise to several arteries, including the left coronary artery, which supplies blood to the left side of the heart muscle.
c. Left subclavian artery: The left subclavian artery arises from the aortic arch, not directly from the ascending aorta. It supplies blood to the left arm and head.
d. Left intercostal artery: The intercostal arteries arise directly from the aorta, not specifically the ascending aorta. They supply blood to the muscles and tissues between the ribs.
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