Left auricle receives pure blood from?

Appeared in: HPSSC Staff Nurse - 2021

Explanation

The left atrium (of which the auricle is a part) is the chamber of the heart that receives oxygenated blood from the lungs.
The term 'pure blood' refers to oxygenated blood, which is rich in oxygen after gas exchange in the pulmonary capillaries.
The four pulmonary veins are the specific blood vessels responsible for transporting this oxygenated blood from both lungs into the left atrium.

Option B: The pulmonary artery carries deoxygenated ('impure') blood away from the heart.
Option C: The superior vena cava brings deoxygenated blood from the upper part of the body into the right atrium, not the left.
Option D: The inferior vena cava brings deoxygenated blood from the lower part of the body into the right atrium, not the left.

Clinical Relevance

Nursing practice connection: Knowing Blood flow through the heart and pulmonary circulation helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A thorough understanding of blood flow is fundamental for nurses to assess cardiac function, interpret diagnostic tests like echocardiograms, and recognize signs of congenital heart defects or heart failure.
What if? If a patient has a patent foramen ovale (a hole between the left and right atria), deoxygenated blood from the right atrium can mix with oxygenated blood in the left atrium. This reduces the oxygen saturation of blood going to the body and can lead to a paradoxical embolism (stroke) if a clot passes through the defect.

How to Approach the Question

First, decode the key terms in the question: 'Left auricle' refers to the left atrium, and 'pure blood' means oxygenated blood.
Next, recall the two main circuits of blood flow: systemic (body) and pulmonary (lungs).
Trace the path of blood after it leaves the lungs. It has just been oxygenated, so it is 'pure'.
This oxygenated blood must return to the left side of the heart to be pumped to the rest of the body. The vessels that carry blood from the lungs to the left atrium are the pulmonary veins.
Evaluate the options based on this pathway. The pulmonary artery carries blood to the lungs. The vena cavae carry blood to the right atrium. Only the pulmonary veins carry blood from the lungs to the left atrium.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e pp. 161-163, 162-164

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