Question

Explain the nutrition in Amoeba with a labelled diagram OR Draw the Human
Digestive System and write the roles of Buccal cavity, stomach, liver, pancreas and small
intestine in digestion of food.​

Answer 1

Question

Draw the Human Digestive System and write the roles of buccal cavity, stomach, liver, pancreas and small intestine in digestion of food.​

Answer

The process of digestion is defined as the breakdown of complex food components into simpler substances such that they can be utilized efficiently by the body.

• Buccal Cavity

This breakdown begins at the buccal cavity in humans. The buccal cavity includes the entire mouth. Teeth, tongue and saliva carry out the first step in human digestion.

→ Teeth are used for cutting, biting and breaking down the ingested food to smaller bits.

→ Saliva is produced by the salivary glands in the mouth. It also helps in the breakdown of starch present in food into sugars.

→ Tongue mixes saliva with the food components and swallows the food so it could proceed into the food pipe.

• Stomach

After the food has travelled down the food pipe, it lands into the stomach. The inner lining of the stomach plays a vital role in digestion. It secretes:

→ Hydrochloric acid (HCl): kills germs that invade the stomach with the food.

→ Digestive juices: break down the nutrient protein into a simpler form.

→ Mucous: maintains and takes care of the stomach's lining.

• Liver

Liver is an organ closely associated with the small intestine. Its job is to produce bile juice that also helps in the breakdown of food and nutrients, especially fats.

• Pancreas

Pancreas is an important gland located in the abdomen. It converts nutrients like fats and carbohydrates into simpler substances.

• Small intestine

Small intestine is like the hub of the secretions secreted by the liver and pancreas. It also has its own secretions, though.

→ The small intestine produces juices that convert proteins, carbohydrates and fats to simpler substances.

→ It absorbs nutrients and minerals from the food components to be transported to different organs through blood vessels.

The attachment shows the diagram of the human digestive system. :)