Question

Which of the following is not a part of the human digestive system?

• A. Stomach
• B. Pancreas
• C. Liver
• D. Lungs

Hint:

*Remember:* The digestive system includes organs that help process food, while the lungs are part of the respiratory system.

Answer 1

The Correct Option is D

To determine the organ not involved in digestion, we must first understand the human digestive system and the functions of the listed organs.

1. Definition of the Digestive System

The digestive system is responsible for breaking down ingested food into absorbable nutrients and energy for the body, while also expelling waste products.

2. Key Organs of the Digestive System:

• Stomach: Acts as a muscular sac that combines food with digestive fluids, initiating breakdown into a semi-liquid state. It is crucial for digestion.
• Pancreas: Produces vital digestive enzymes essential for metabolizing proteins, fats, and carbohydrates. It also synthesizes hormones, such as insulin, which regulate blood glucose levels.
• Liver: Secretes bile, a fluid that aids in fat digestion. It further processes nutrients absorbed from the small intestine and detoxifies the body.

3. The Role of the Lungs:

• The lungs belong to the respiratory system, distinct from the digestive system.
• Their primary function is respiration, facilitating the intake of oxygen and the expulsion of carbon dioxide from the blood.
• The lungs do not participate in the breakdown of food or nutrient absorption.

4. Conclusion:

- The stomach, pancreas, and liver are integral to the digestive process.
- The lungs are vital for respiration but play no role in food digestion.

Final Determination:

The organ excluded from the human digestive system is the lungs.