The nurse is reviewing the sequence of the cardiac cycle. The nurse recognizes that the electrical stimulus of the cardiac cycle follows which sequence?

AV node-SA node bundle of His- bundle branches

SA node- AV node-bundle of His -bundle branches

Bundle of His- AV node- SA node- Erb's Point

AV node-SA node-bundle of His- Erb's Point

Answer and Explanation

The Correct Answer is B

A. AV node - SA node - bundle of His - bundle branches:

This sequence is incorrect. The SA node (sinoatrial node) initiates the electrical impulse in the heart, followed by the AV node (atrioventricular node), bundle of His, and then the bundle branches.

B. SA node - AV node - bundle of His - bundle branches:

This sequence is correct. The electrical stimulus of the cardiac cycle starts at the SA node, which is the natural pacemaker of the heart. From the SA node, the impulse travels to the AV node, then to the bundle of His, and finally to the bundle branches, which distribute the impulse to the ventricles, causing them to contract.

C. Bundle of His - AV node - SA node - Erb's Point:

This sequence is incorrect. Erb's Point is a point on the chest where heart sounds S2 and S3 can be heard most distinctly.

D. AV node - SA node - bundle of His - Erb's Point:

This sequence is incorrect. The AV node comes after the SA node in the electrical conduction system of the heart. Erb's Point is not a part of the normal cardiac conduction pathway; it is a location for auscultation on the chest.

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Correct Answer is {"dropdown-group-1":"C"}

Explanation

The pacemaker of the heart is known as the sinoatrial (SA) node. The SA node is a specialized group of cells located in the right atrium of the heart. It generates electrical impulses that initiate each heartbeat and set the rhythm for the entire heart.

A. Wheezes B. Whispered pectoriloquy C. Bronchial sounds D. Bronchophony

Correct Answer is A

Explanation

A. Wheezes:

Wheezes are continuous, high-pitched, whistling lung sounds that are heard especially during expiration and sometimes during inspiration. They are caused by the rapid movement of air through narrowed or constricted airways, which is common in conditions like asthma. Wheezing is a characteristic adventitious sound associated with asthma and other obstructive respiratory disorders.

B. Whispered Pectoriloquy:

Whispered Pectoriloquy is an increased loudness of whispering noted during auscultation with a stethoscope on the lung fields. This phenomenon occurs when sound is transmitted clearly through consolidated or compressed lung tissue, making whispered sounds more distinct. It is a sign of lung consolidation, often seen in conditions like pneumonia.

C. Bronchial Sounds:

Bronchial sounds are harsh, high-pitched sounds heard over the trachea and the large bronchi. These sounds are normally heard during expiration. If they are heard over peripheral lung areas, it can indicate consolidation or compression of lung tissue, possibly due to pneumonia or tumor.

D. Bronchophony:

Bronchophony is a phenomenon in which spoken sounds are heard more clearly and distinctly through the stethoscope on auscultation of the lungs. Normally, sounds are muffled during auscultation. Increased clarity of spoken sounds can indicate lung consolidation, similar to whispered pectoriloquy, and is often associated with conditions like pneumonia.

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The nurse is reviewing the sequence of the cardiac cycle. The nurse recognizes that the electrical stimulus of the cardiac cycle follows which sequence?

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Naxlex Comprehensive Predictor Exams

A group of nursing students are studying the conduction system of the heart. The nursing students should recognize that the pacemaker of the heart is known as dropdown

Correct Answer is {"dropdown-group-1":"C"}

Explanation

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Correct Answer is A

Explanation

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