After traveling through the AV node, an electrical impulse travels to which of the following components of an effective cardiac conduction system?
Bundle branches
Purkinje fibers
SA node
Bundle of His
The Correct Answer is D
A. Bundle branches:
The bundle branches are components of the cardiac conduction system that the electrical impulse reaches after it passes through the Bundle of His. These branches carry the impulse down the interventricular septum towards the Purkinje fibers. The bundle branches do not directly follow the AV node in the sequence of conduction.
B. Purkinje fibers:
Purkinje fibers are the final part of the cardiac conduction system that receives the electrical impulse. These fibers distribute the impulse throughout the ventricles, causing them to contract. However, the impulse must first pass through the Bundle of His and bundle branches before reaching the Purkinje fibers.
C. SA node:
The SA node (sinoatrial node. is the heart's natural pacemaker, where the electrical impulse originates. The impulse travels from the SA node to the AV node before it proceeds to the Bundle of His. Therefore, the SA node is involved earlier in the conduction pathway, not after the AV node.
D. Bundle of His:
After the electrical impulse passes through the AV node, it travels to the Bundle of His. The Bundle of His serves as the pathway for the impulse to move from the atria to the ventricles, making it the correct answer. This structure is critical for ensuring that the impulse is properly conducted to the ventricles to facilitate coordinated contraction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Ileocecal sphincter:
The ileocecal sphincter controls the passage of digested material from the small intestine into the large intestine. While important for digestive transit, it does not regulate the release of chyme into the duodenum.
B. Lower esophageal sphincter:
The lower esophageal sphincter is located at the junction between the esophagus and the stomach. It prevents the backflow of stomach contents into the esophagus, but it is not involved in controlling the release of chyme into the duodenum.
C. Pyloric sphincter:
The pyloric sphincter is the valve that controls the release of chyme from the stomach into the duodenum, the first section of the small intestine. It regulates the flow of partially digested food, ensuring it enters the duodenum at an appropriate rate for further digestion and absorption, making it the correct answer.
D. Internal anal sphincter:
The internal anal sphincter is located at the end of the digestive tract and controls the release of feces from the rectum. This sphincter is involved in defecation rather than the release of chyme into the duodenum.
Correct Answer is D
Explanation
A. Carrying deoxygenated blood from the lungs to the heart: This describes the role of the pulmonary veins, not the pulmonary artery. The pulmonary veins carry oxygenated blood from the lungs back to the left side of the heart.
B. Carrying oxygenated blood from the lungs to the left side of the heart: This function is also performed by the pulmonary veins. The pulmonary arteries are responsible for carrying deoxygenated blood away from the heart.
C. Carrying oxygenated blood from the heart to the peripheral tissue: This function is handled by the aorta and systemic arteries, not the pulmonary artery. The aorta distributes oxygenated blood from the left side of the heart to various tissues throughout the body.
D. Carrying deoxygenated blood from the right side of the heart to the lungs: The pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs. In the lungs, the blood receives oxygen and releases carbon dioxide before returning to the heart via the pulmonary veins.
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