The chamber of the heart that receives oxygenated blood from the lungs is?

Appeared in: NHM MP Staff Nurse - 2015

Explanation

The left atrium is the upper-left chamber of the heart.
Its primary function is to act as a receiving chamber for oxygenated blood returning from the lungs.
This blood is delivered to the left atrium by the four pulmonary veins.
From the left atrium, the blood passes through the mitral valve into the left ventricle.

Option B: The right atrium receives deoxygenated blood from the body, not oxygenated blood from the lungs. This blood comes from the superior and inferior vena cava.
Option C: The left ventricle is a pumping chamber, not a receiving chamber from the lungs. It receives oxygenated blood from the left atrium and pumps it into the aorta to supply the rest of the body.
Option D: The right ventricle receives deoxygenated blood from the right atrium and pumps it to the lungs. It handles deoxygenated blood, not oxygenated blood.

Clinical Relevance

Nursing practice connection: Knowing Cardiac Anatomy and Blood Flow 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, and recognize signs of cardiovascular disease.
For example, in left-sided heart failure, the left ventricle weakens and cannot pump blood effectively. This causes blood to back up into the left atrium and, subsequently, the lungs, leading to pulmonary congestion and edema, a life-threatening condition.
What if? If a patient has an Atrial Septal Defect (ASD), a hole between the atria, oxygenated blood from the higher-pressure left atrium shunts to the right atrium. This mixes blood and increases the volume pumped to the lungs, which can lead to right-sided heart enlargement and pulmonary hypertension over time.

How to Approach the Question

This is a factual recall question testing your knowledge of cardiac anatomy and physiology.
First, break down the question: it asks for the chamber that 'receives' 'oxygenated blood' 'from the lungs'.
Recall the basic functions of the heart's sides: the left side handles oxygenated blood, and the right side handles deoxygenated blood. This eliminates the right atrium and right ventricle.
Next, recall the function of the chambers: atria are 'receiving' chambers, and ventricles are 'pumping' chambers.
The question asks for a chamber that 'receives' blood. This points towards an atrium.
Combine these facts: The chamber that receives oxygenated blood must be the left atrium.

Concept Tested & Keywords

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

E6 Anatomy MindMaps BDChaurasia V1 10e p. 13-15

Practise the full NHM MP Staff Nurse - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.