Find the correct statements related to absorption in the human digestive system from the following:

1. Some minerals, medicines, and water are absorbed in the large intestine.
2. Some medicines and alcohol are absorbed by the mucous membrane of the mouth and the lower part of the tongue.
3. Absorption of water, simple sugars, and alcohol occurs in the stomach.
4. Absorption of glucose, lactose, and glycogen occurs in the small intestine. Choose the most appropriate answer from the options given below:

1. A

   Only 2 and 4

2. B

   Only 1, 2 and 3

3. C

   Only 1 and 3

4. D

   Only 2, 3 and 4

Appeared in: Raj. CHO -2024

Explanation

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• Statement 1 is correct: The large intestine's primary functions include absorbing water and electrolytes (minerals).
• Statement 2 is correct: The mouth (sublingual mucosa) is a site for the rapid absorption of certain drugs, bypassing initial liver metabolism.
• Statement 3 is correct: The stomach can absorb water, alcohol, and some simple sugars, although it is not the main site for nutrient absorption.
• The combination of these three correct statements makes this option the right choice.

Why Other Options Were Wrong

• Option A: This option incorrectly includes statement 4 and omits the correct statements 1 and 3.
• Option C: This option is incomplete as it omits the correct statement 2. Certain medicines are indeed absorbed in the mouth.
• Option D: This option incorrectly includes statement 4 and omits the correct statement 1.

Related Visual

• Visual 1: Diagram - An annotated diagram of the human digestive system, highlighting the mouth, stomach, small intestine, and large intestine, with labels indicating the primary substances absorbed in each section. This visual would clarify the distinct roles of each organ in absorption.
• Visual 2: Flowchart - A flowchart illustrating the process of carbohydrate digestion and absorption, showing how polysaccharides (like starch, glycogen) and disaccharides (like lactose) are broken down into monosaccharides (like glucose) before they can be absorbed by the intestinal wall.

Clinical Relevance

• Nursing practice connection: Knowing Sites of nutrient and substance absorption in the human digestive system helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Understanding absorption sites is crucial for medication administration. For example, sublingual nitroglycerin for angina works rapidly because it is absorbed directly into the bloodstream from the mouth, bypassing the digestive system and liver.
• Knowledge of carbohydrate absorption explains conditions like lactose intolerance. A deficiency in the enzyme lactase prevents the breakdown of lactose in the small intestine, leading to gastrointestinal symptoms when it passes into the large intestine.
• What if a patient has had a large portion of their small intestine surgically removed (e.g., due to Crohn's disease)? Their ability to absorb most nutrients, vitamins, and water would be severely compromised, leading to malabsorption and requiring nutritional support, often through IV (parenteral) nutrition.

How to Approach the Question

• First, read the main question to understand the topic: absorption in the digestive system.
• Address each numbered statement individually. Evaluate its factual accuracy based on your knowledge of physiology.
• For statement 1, recall the function of the large intestine (water/mineral absorption).
• For statement 2, think about routes of drug administration (sublingual) and alcohol absorption.
• For statement 3, consider the stomach's role beyond just holding food.
• For statement 4, differentiate between digestion and absorption. Complex carbs must be digested before they can be absorbed.

Concept Tested & Keywords

• Concept Tested: Sites of nutrient and substance absorption in the human digestive system.
• Stem keywords: absorption, human digestive system, large intestine, mouth, stomach, small intestine
• Lead-in keywords: Find the correct statements, Choose the most appropriate answer

Question ID

Q35sJbzZ9Aj47HvBcB96Ws

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