The number of chambers in human heart is

Appeared in: UPPSC 2022

Explanation

The human heart is a four-chambered organ, a fundamental concept in human anatomy and physiology.
It consists of two upper chambers called atria (right and left) and two lower chambers called ventricles (right and left).
The right atrium receives deoxygenated blood from the body and passes it to the right ventricle.
The right ventricle pumps this deoxygenated blood to the lungs for oxygenation.
The left atrium receives oxygenated blood from the lungs and passes it to the left ventricle.
The left ventricle, the strongest chamber, pumps this oxygenated blood to the entire body.

Option A: A one-chambered heart does not exist in vertebrates. This structure would not be able to separate oxygenated and deoxygenated blood, making it incompatible with the metabolic needs of complex organisms.
Option B: A two-chambered heart (one atrium, one ventricle) is characteristic of fish, not humans. This setup is suitable for their single-loop circulatory system but is inefficient for terrestrial life.
Option C: A three-chambered heart (two atria, one ventricle) is found in amphibians and most reptiles. This design allows for some mixing of oxygenated and deoxygenated blood in the single ventricle.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the human heart, specifically the number of chambers as background academic context rather than a clinical decision trigger.
The four-chambered structure is vital for separating the pulmonary (to the lungs) and systemic (to the body) circuits, ensuring that tissues receive fully oxygenated blood to support high metabolic rates.
Congenital heart defects, such as an Atrial Septal Defect (ASD) or Ventricular Septal Defect (VSD), are holes in the septa separating the chambers. These defects can cause mixing of oxygenated and deoxygenated blood, leading to cyanosis, heart failure, and other complications.
What if? If a newborn has a large Ventricular Septal Defect (VSD), oxygenated blood from the high-pressure left ventricle shunts into the right ventricle. This increases blood flow to the lungs, causing pulmonary hypertension and eventually leading to right-sided heart failure if not corrected.

How to Approach the Question

This is a factual recall question testing basic knowledge of human anatomy.
Identify the key terms in the question: 'human heart' and 'chambers'.
Access your memory of the fundamental structure of the heart.
Recall that the heart is divided into a right and left side, and each side has an upper (atrium) and lower (ventricle) chamber.
Calculate the total number of chambers (2 atria + 2 ventricles = 4).
Select the option that matches this number.

Concept Tested & Keywords

Concept Tested: Anatomy of the human heart, specifically the number of chambers.
Stem keywords: human heart, chambers
Lead-in keywords: number of

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E6 Physiology Essentials Sembulingam 10e Part 2 p. 160-162

E6 Anatomy Applied Ashalatha 4e p. 161-163

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