Digestion Processes and Functions

The video explains the process of human digestion, starting with saliva production in the mouth, where both mechanical and chemical digestion begin. Mechanical digestion involves the physical breakdown of food, while chemical digestion uses enzymes to break down complex molecules. The small intestine plays a crucial role in nutrient absorption, with villi aiding in transporting nutrients into the bloodstream. Finally, undigested food is processed in the large intestine and expelled as waste.

How much saliva does a healthy human adult produce daily?

• Up to one liter

• Up to one and a half liters

• Up to two liters

• Up to half a liter

What is the first step in the digestion process?

• Absorption

• Excretion

• Ingestion

• Metabolism

What begins the process of mechanical digestion?

• Stomach acids

• Chewing by the teeth

• Enzymes

• Saliva

What continues mechanical digestion after swallowing?

• Salivary glands

• Muscular action of the stomach and intestines

• Pancreatic juice

• Villi

Which enzyme in the mouth starts the chemical digestion of starch?

• Trypsin

• Amylase

• Lipase

• Pepsin

Where does chemical digestion mostly take place?

• Mouth

• Stomach

• Small intestine

• Large intestine

What is the role of pancreatic juice in digestion?

• It breaks down proteins only

• It neutralizes stomach acids and breaks down various molecules

• It absorbs nutrients

• It produces saliva

What is the function of villi in the small intestine?

• They transport nutrients into the bloodstream

• They secrete digestive enzymes

• They produce bile

• They neutralize stomach acids

Where is undigested food processed before being ejected as waste?

• Mouth

• Large intestine

• Stomach

• Small intestine

What ensures the efficient breakdown and absorption of food?

• Neither mechanical nor chemical digestion

• Both mechanical and chemical digestion

• Only chemical digestion

• Only mechanical digestion