Which organs are primarily involved in digestion?

• A. Kidneys and ureters
• B. Mouth, stomach, and intestines
• C. Heart and blood vessels
• D. Thymus and lymph nodes

Answer: (B)

The primary organs involved in digestion are indeed the mouth, stomach, and intestines. The process of digestion begins in the mouth, where food is mechanically broken down by chewing and mixed with saliva to begin the chemical breakdown of carbohydrates.

The stomach further processes the food through both mechanical and chemical means, utilizing digestive acids and enzymes to break down proteins and kill microbes. After the stomach, the partially digested food moves into the intestines, where the majority of nutrient absorption occurs.

The small intestine is particularly crucial for the absorption of nutrients into the bloodstream, while the large intestine is involved in absorbing water and electrolytes and preparing waste for excretion. Together, these organs work cohesively to ensure that food is efficiently processed and nutrients are absorbed for the body’s use.

In contrast, the other options involve organs that have different primary functions. The kidneys and ureters are involved in the excretion of waste products and the regulation of fluids, the heart and blood vessels are primarily responsible for circulation, and the thymus and lymph nodes play a role in the immune system rather than the digestive process.