Partial removal of which segment of the small intestine would be a drastic procedure to promote weight loss due to reduced absorptive area?

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Multiple Choice

Partial removal of which segment of the small intestine would be a drastic procedure to promote weight loss due to reduced absorptive area?

The key idea is that reducing the area where nutrients are absorbed in the small intestine would have the biggest impact on absorption and, in theory, weight loss. The small intestine is lined with villi and microvilli to maximize surface area, and among its sections, the jejunum serves as the main site for absorbing most nutrients—carbohydrates, amino acids, fats, electrolytes, and much of the water. If a large portion of this absorptive tissue were removed, the body's ability to take in nutrients would drop sharply, producing malabsorption and associated weight loss. The other segments play supporting roles but not to the same extent. The duodenum mainly handles mixing chyme with bile and pancreatic enzymes and begins some iron and calcium absorption, but it isn’t the primary site for bulk nutrient absorption. The ileum is important for absorbing bile acids and vitamin B12 and some fats, but removing it would cause different problems and wouldn’t reduce overall absorptive capacity as dramatically. The cecum is part of the large intestine and is not a small-intestine segment involved in the major absorptive process. So, partial removal of the jejunum would most drastically cut absorptive area and drive the intended effect.

The key idea is that reducing the area where nutrients are absorbed in the small intestine would have the biggest impact on absorption and, in theory, weight loss. The small intestine is lined with villi and microvilli to maximize surface area, and among its sections, the jejunum serves as the main site for absorbing most nutrients—carbohydrates, amino acids, fats, electrolytes, and much of the water. If a large portion of this absorptive tissue were removed, the body's ability to take in nutrients would drop sharply, producing malabsorption and associated weight loss.

The other segments play supporting roles but not to the same extent. The duodenum mainly handles mixing chyme with bile and pancreatic enzymes and begins some iron and calcium absorption, but it isn’t the primary site for bulk nutrient absorption. The ileum is important for absorbing bile acids and vitamin B12 and some fats, but removing it would cause different problems and wouldn’t reduce overall absorptive capacity as dramatically. The cecum is part of the large intestine and is not a small-intestine segment involved in the major absorptive process.

So, partial removal of the jejunum would most drastically cut absorptive area and drive the intended effect.

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