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 A

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. Increased temperature B. Increase hematocrit C. Blood pressure 180/100 D. Respiratory rate 32 E. Heart rate 120bpm

Correct Answer is ["C","D"]

Explanation

A. Increased temperature: Fluid overload typically doesn't cause an increased temperature. Infections or other inflammatory processes are more likely causes of elevated body temperature.

B. Increased hematocrit: Fluid overload usually results in dilution of blood components, leading to a decreased hematocrit (lower concentration of red blood cells in the blood). An increased hematocrit is not a typical finding in fluid overload.

C. Blood pressure 180/100: Elevated blood pressure can be associated with fluid overload, especially if the overload is chronic. This is a correct assessment finding that requires intervention and monitoring.

D. Respiratory rate 32: An increased respiratory rate can be a sign of respiratory distress, which may occur in severe cases of fluid overload, especially if it leads to pulmonary edema. This is a correct assessment finding that requires intervention and further evaluation.

E. Heart rate 120 bpm: An increased heart rate can be a compensatory mechanism in response to fluid overload, especially if the heart is trying to maintain cardiac output. However, this heart rate alone is not specific enough to confirm fluid overload. Other signs and symptoms, such as edema, increased blood pressure, and respiratory distress, are more indicative of fluid overload.

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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

The nurse is assessing a client diagnosed with fluid overload. The nurse should implement priority interventions for which of the following assessment findings? (Select all that apply.)

Correct Answer is ["C","D"]

Explanation

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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