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. The atria contract toward the end of diastole and push the remaining blood into the ventricles.

This choice is correct. During atrial systole (atrial contraction), the atria contract, pushing the remaining blood into the ventricles. This additional filling of the ventricles optimizes cardiac output.

B. The atria contract during systole and attempt to push against closed valves.

This statement is incorrect. The atria do not contract during systole; they contract during diastole (atrial systole) to fill the ventricles.

C. Atrial kick is the pressure exerted against the atria as the ventricles contract during systole.

This statement is incorrect. Atrial kick refers to the atrial contraction, not the pressure exerted against the atria.

D. Contraction of the atria at the beginning of diastole can be felt as a palpitation.

This statement is not entirely accurate. A palpitation is a sensation of rapid or strong heartbeat, which might be felt during various cardiac events, not specifically during atrial contraction at the beginning of diastole.

A. Maxillary sinusitis B. Nasal polyps. C. Frontal sinusitis. D. Posterior epistaxis.

Correct Answer is A

Explanation

A. Maxillary sinusitis:

Explanation: The client's symptoms of facial pain, fever, malaise, swollen turbinates, purulent nasal discharge, and dull, throbbing pain in the cheeks and teeth on the right side, especially when palpated, are indicative of maxillary sinusitis. Maxillary sinusitis refers to the inflammation of the maxillary sinuses, which are located in the cheek area. The symptoms described align with a bacterial infection in this sinus.

B. Nasal polyps:

Explanation: Nasal polyps are soft, noncancerous growths on the lining of the nasal passages or sinuses. While they can cause nasal congestion and a runny nose, they do not typically present with the specific symptoms mentioned in the scenario, such as facial pain, fever, and purulent discharge.

C. Frontal sinusitis:

Explanation: Frontal sinusitis involves inflammation of the frontal sinuses located in the forehead area. Symptoms may include forehead pain, headache, and nasal discharge. However, the described symptoms in the scenario (dull, throbbing pain in the cheeks and teeth on the right side) are more characteristic of maxillary sinusitis.

D. Posterior epistaxis:

Explanation: Posterior epistaxis refers to a nosebleed that originates from the back of the nose, often due to bleeding from the sphenopalatine artery. While nosebleeds can cause blood drainage into the throat and result in a metallic taste, the other symptoms described in the scenario, such as facial pain, fever, and purulent discharge, are not indicative of posterior epistaxis.

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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 nurse is reviewing the anatomy and physiologic functioning of the heart. The nurse should recognize that which statement best describes the atrial kick?

Correct Answer is A

Explanation

Correct Answer is A

Explanation

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