Question:
Find the odd one out: Heart, Lungs, Kidney, Skin, Liver
Find the odd one out: Heart, Lungs, Kidney, Skin, Liver
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When all items look similar, look for “inside vs. outside”, “living vs. non-living”, or a different system/function.
Updated On: Jul 15, 2026
- Skin
- Lungs
- Heart
- Kidney
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The Correct Option is A
Approach Solution - 1
Heart, Lungs, Kidney, and Liver are all internal visceral organs.
“Skin” is anatomically an organ too, but it is the external covering (integument) and functions primarily in protection/thermoregulation, not a visceral organ. Therefore it is the odd one out.
“Skin” is anatomically an organ too, but it is the external covering (integument) and functions primarily in protection/thermoregulation, not a visceral organ. Therefore it is the odd one out.
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Approach Solution -2
The question lists five body parts, Heart, Lungs, Kidney, Skin, Liver, and asks which does not belong with the rest. Let's look at each of the four listed options individually:
- Skin: Skin is the body's outer covering. It lies on the outside of the body, wrapping around and protecting everything inside, and its main jobs are protection, sensation, and regulating body temperature.
- Lungs: The lungs sit inside the chest cavity and carry out gas exchange, taking in oxygen and removing carbon dioxide from the blood. They are located deep within the body.
- Heart: The heart also sits inside the chest cavity, enclosed by the ribcage, and its job is to pump blood through the body. It too is an internal organ.
- Kidney: The kidneys sit inside the abdominal cavity and filter waste from the blood to form urine. They are also enclosed within the body.
Lungs, Heart, and Kidney, along with Liver, are all housed inside the body's cavities and work on substances circulating within the body. Skin, by contrast, forms the outer boundary of the body and faces the external environment, making it structurally and functionally different from the rest.
Therefore, the correct answer is Skin.
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Approach Solution -3
The list is Heart, Lungs, Kidney, Skin, and Liver, and we need to find the one that does not belong with the rest. One way to test this is by looking at each organ's basic shape and structure, rather than its location:
- Skin: Skin is not a compact, self-contained lump of tissue with a fixed boundary, it is a single continuous sheet that stretches over and wraps around the entire body. It is, in fact, the largest organ by surface area, and its structure is fundamentally a covering membrane rather than a discrete mass.
- Lungs: The lungs are a pair of distinct, spongy, sac-like organs with a clearly defined outer boundary, sitting as compact structures within the chest.
- Heart: The heart is a single, compact, muscular organ with a clearly defined shape, entirely self-contained within the chest cavity.
- Kidney: The kidneys are a pair of bean-shaped, compact organs, each with a well-defined boundary, sitting as discrete structures in the abdomen.
Lungs, Heart, and Kidney, along with Liver, are all discrete, compact organs with a defined shape and boundary. Skin, by contrast, is structured as a continuous covering sheet rather than a compact mass, making it structurally distinct from the rest.
Therefore, the correct answer is Skin.
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