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. Auricle (Pinna):

The auricle, also known as the pinna, is the visible external part of the ear. It consists of movable cartilage and skin. When administering eardrops, pulling the auricle up and back helps to straighten the ear canal, allowing the drops to enter the ear effectively.

B. Mastoid Process:

The mastoid process is a bony prominence located behind the ear. It is not a part of the outer ear structure involved in administering eardrops.

C. Outer Meatus:

The outer meatus, also known as the external acoustic meatus or ear canal, is the tube-like structure leading from the auricle to the eardrum. It is the passage through which eardrops are administered. Pulling the auricle up and back helps to straighten the outer meatus for the proper administration of eardrops.

D. Concha:

The concha refers to the bowl-shaped depression next to the ear canal. While it is a part of the outer ear, pulling the concha is not a technique used for administering eardrops. The auricle, specifically, is manipulated to facilitate the process.

A. The best time to perform a BSE is 4 to 7 days after the first day of the menstrual period. B. If she suspects that she is pregnant, then the woman should not perform a BSE until her baby is born. C. The best time to perform BSE is in the middle of the menstrual cycle. D. The woman needs to perform BSE only bimonthly unless she has fibrocystic breast tissue.

Correct Answer is A

Explanation

A. The best time to perform a BSE is 4 to 7 days after the first day of the menstrual period:

This statement is correct. Performing BSE a few days after the menstrual period ensures that the breasts are less likely to be swollen or tender, which can make it easier to detect any unusual changes.

B. If she suspects that she is pregnant, then the woman should not perform a BSE until her baby is born:

This statement is incorrect. Pregnant women can still perform breast self-examinations. In fact, it's important for pregnant women to be aware of any changes in their breasts.

C. The best time to perform BSE is in the middle of the menstrual cycle:

This statement is not as accurate as the first choice. While it's true that performing BSE a few days after the menstrual period can be easier due to reduced breast tenderness, it doesn't necessarily mean the middle of the menstrual cycle for every woman. The timing can vary based on an individual's menstrual cycle.

D. The woman needs to perform BSE only bimonthly unless she has fibrocystic breast tissue:

This statement is incorrect. Regular monthly breast self-examinations are recommended for all women, regardless of whether they have fibrocystic breast tissue or not. Detecting changes early is crucial for breast health.

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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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Correct Answer is A

Explanation

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Explanation

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