Question 1

How does the human digestive system break down food for energy?

Accepted Answer

Digestion is a multi-step process. First, your mouth chews food and salivary enzymes break down starches.

Next, the stomach uses acids and enzymes to churn food into liquid before nutrients are absorbed.

Question 2

What is the main role of salivary glands in digestion?

Accepted Answer

Salivary glands produce saliva, which moistens food to make swallowing easier. Saliva also contains digestive enzymes.

These enzymes begin the chemical breakdown of carbohydrates right inside your mouth cavity, starting the digestive process.

Question 3

How does the stomach protect itself from its own acid?

Accepted Answer

The stomach lining has a thick layer of mucus. This mucus barrier acts as a shield against gastric juices.

These juices contain strong hydrochloric acid. Without this protective lining, the acid would dissolve the stomach walls and cause damage.

Question 4

What functions do the liver and gallbladder perform during digestion?

Accepted Answer

The liver produces a digestive fluid called bile, which helps break down fats in your food.

The gallbladder stores this bile. When you eat fatty foods, the gallbladder releases bile into the small intestine to assist absorption.

Question 5

Why is the small intestine considered the most important organ?

Accepted Answer

The small intestine is where most chemical digestion takes place. It is also the main site for nutrient absorption.

Its walls are lined with millions of tiny villi that transfer vitamins and minerals directly into your blood.

Question 6

How do villi increase the absorption capacity of small intestine?

Accepted Answer

Villi are millions of microscopic, finger-like folds. They line the inner walls of the small intestine.

These folds increase the surface area drastically. This allows your body to absorb nutrients much faster and more efficiently from digested food.

Question 7

What is the main difference between small and large intestines?

Accepted Answer

The small intestine digests food and absorbs vital nutrients into your bloodstream using microscopic villi.

The large intestine absorbs water and mineral salts from the remaining waste material. It turns liquid waste into solid stool.

Question 8

What role does the epiglottis play when we swallow?

Accepted Answer

The epiglottis is a small, leaf-shaped cartilage flap in your throat. It acts as a safety switch.

When you swallow food, it folds down to cover your windpipe. This ensures food goes into the esophagus rather than your lungs.

Digestive System

Biology & Physiology