MCQ Detailed View

Salt, scientifically known as sodium chloride (NaCl), is an essential part of the human diet. While it can enhance the taste of food, its primary biological function is more critical. The main role of salt in nutrition is to help the stomach produce hydrochloric acid (HCl), which is necessary for proper digestion.

Hydrochloric acid is a strong acid secreted by the stomach lining. It helps break down food into simpler molecules, activates digestive enzymes like pepsin, and kills harmful microorganisms present in food. Without enough sodium from dietary salt, the body would struggle to maintain adequate hydrochloric acid levels, leading to poor digestion and nutrient absorption.

Salt also plays other important roles in the body:

1. 
   

   Fluid balance: Sodium helps maintain the balance of fluids inside and outside cells.

   
   


2. 
   

   Nerve function: Sodium ions are essential for transmitting nerve impulses.

   
   


3. 
   

   Muscle function: Sodium contributes to proper muscle contraction.

   
   

Although adding salt can enhance flavor (Option 2), the main physiological function is related to digestion through hydrochloric acid production. Options like easing cooking (Option 1) or increasing solubility of food (Option 4) are secondary or incorrect from a biological perspective.

The recommended daily intake of salt ensures that the body can produce sufficient hydrochloric acid while maintaining electrolyte balance. This highlights the critical connection between dietary sodium and digestive health.

In conclusion, the main use of salt in the human diet is to produce a small amount of hydrochloric acid required for digestion (Option 3). Understanding this helps students appreciate the role of essential nutrients beyond just flavor enhancement.

✅ Correct Answer: Produce small amount of hydrochloric acid required for digestion (Option 3)