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 A

Explanation

A. Consists of two lobes.

This statement is correct. The left lung consists of two lobes: the upper lobe and the lower lobe. The right lung, not the left lung, has three lobes: upper, middle, and lower lobes.

B. Primarily consists of an upper lobe on the posterior chest.

This statement is not accurate. The upper lobe of the left lung is present in the anterior and posterior parts of the chest. It is not limited to the posterior chest.

C. Is shorter than the right lung because of the underlying stomach.

This statement is not correct. The left lung is not shorter due to the underlying stomach. The left lung is slightly smaller than the right lung to accommodate the space for the heart, but this size difference is not due to the stomach.

D. Is divided by the horizontal fissure.

This statement is not accurate. The left lung is not divided by the horizontal fissure. The horizontal fissure is a feature of the right lung, not the left lung. The left lung is divided by the oblique fissure into the upper and lower lobes

A. A slight asymmetry in breast size can be expected B. Asymmetry of breast size and shape is probably due to breastfeeding and is nothing to worry about. C. A sudden uneven increase in breast size is normal in adults D. Breasts should always be symmetric.

Correct Answer is A

Explanation

A. A slight asymmetry in breast size can be expected: This response is accurate. It acknowledges the natural variation in breast size that many women experience. It's common for one breast to be slightly larger or shaped differently than the other. It assures the client that this asymmetry is normal and not a cause for concern.

B. Asymmetry of breast size and shape is probably due to breastfeeding and is nothing to worry about: While breastfeeding can cause temporary changes in breast size and shape, not all cases of breast asymmetry are related to breastfeeding. This statement might not cover all situations, making it less accurate.

C. A sudden uneven increase in breast size is normal in adults: This statement is not accurate. Sudden changes in breast size should always be investigated, as they can indicate underlying health issues and may not be considered normal.

D. Breasts should always be symmetric: This statement is not accurate. Perfect symmetry in breast size and shape is rare. Most women have some degree of asymmetry, which is entirely normal. It's important to reassure the client that slight differences are common and not a cause for concern.

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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

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Correct Answer is A

Explanation

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Correct Answer is A

Explanation

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