Digestive System Functions and Enzymes

The video explains the human digestive system, starting from the mouth where digestion begins with saliva. It covers the role of the stomach and gastric juices, the function of the duodenum with bile and pancreatic juices, and the completion of digestion in the small intestine where nutrients are absorbed. Finally, it describes the large intestine's role in water absorption and waste elimination.

What is the role of saliva in the mouth during digestion?

• It breaks down proteins into amino acids.

• It converts starch into maltose.

• It emulsifies fats.

• It absorbs nutrients.

Which enzyme in the stomach is responsible for breaking down proteins?

• Maltase

• Pepsin

• Lipase

• Amylase

What is the primary function of bile in the digestive process?

• To absorb water

• To convert starch into glucose

• To emulsify fats

• To break down proteins

Which enzyme in the pancreatic juice acts on starch?

• Trypsin

• Peptidase

• Amylase

• Lipase

In which part of the digestive system is digestion completed?

• Large intestine

• Small intestine

• Stomach

• Mouth

What is the function of villi in the small intestine?

• To store nutrients

• To produce bile

• To increase surface area for absorption

• To secrete digestive enzymes

Which nutrients are absorbed directly into the blood vessels of the villi?

• Starch and proteins

• Fatty acids and glycerol

• Glucose and amino acids

• Vitamins and minerals

Which enzyme is responsible for converting polypeptides into amino acids?

• Peptidase

• Lipase

• Amylase

• Renin

What happens to the unwanted food after digestion?

• It is expelled from the body as waste.

• It is stored in the stomach.

• It is converted into bile.

• It is absorbed in the small intestine.

Where is water absorbed in the digestive system?

• Mouth

• Large intestine

• Stomach

• Small intestine