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 C

Explanation

In this sequence:

Vena cava brings deoxygenated blood from the body into the right atrium.

Blood flows from the right atrium to the right ventricle through the tricuspid valve.

The right ventricle pumps blood into the pulmonary artery to the lungs.

In the lungs, blood is oxygenated and returns to the heart via the pulmonary veins into the left atrium.

From the left atrium, blood moves to the left ventricle through the bicuspid (mitral) valve.

The left ventricle then pumps oxygenated blood into the body through the aorta.

This sequence represents the systemic and pulmonary circulation of the heart.

A. The eyes converge to focus on the light. B. The eye focuses the image in the center of the pupil. C. Dilation of both pupils occurs in response to bright light. D. Constriction of both pupils occurs in response to bright light.

Correct Answer is D

Explanation

A. The eyes converge to focus on the light.

This statement refers to the convergence reflex, where both eyes move medially (towards each other) to maintain single binocular vision when focusing on a near object. It is not related to the pupillary light reflex, which involves changes in pupil size in response to light.

B. The eye focuses the image in the center of the pupil.

This choice does not accurately describe the pupillary light reflex. The pupillary light reflex involves constriction of the pupil in response to light, not focusing an image in the center of the pupil.

C. Dilation of both pupils occurs in response to bright light.

This statement is incorrect. In response to bright light, the pupils should constrict, not dilate. Dilation of pupils in bright light could indicate an abnormal response, such as in cases of certain neurological conditions or drug use.

D. Constriction of both pupils occurs in response to bright light.

This choice is correct. In the pupillary light reflex, both pupils constrict when exposed to bright light. This response is a protective mechanism to prevent excessive light from entering the eyes, ensuring optimal visual acuity.

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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

The nurse is discussing the blood flow pattern of the heart. The nurse should recognize which of the following as the accurate blood flow pattern of the heart?

Correct Answer is C

Explanation

A nurse documents that the client has a normal pupillary light reflex. The nurse should recognize that this reflex indicates which of the following?

Correct Answer is D

Explanation

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