Understanding the Role of Saliva in Digestion

The video explains the role of saliva in digestion, starting in the mouth where it helps break down food into a bolus. An experiment is conducted to show how saliva affects starch, turning it from violet to white by breaking it down into sugar molecules. Saliva contains the enzyme amylase, which is crucial for converting starch into glucose, making it absorbable in the bloodstream.

What is the first step of digestion that occurs in the mouth?

• Swallowing the food

• Breaking down food into small parts

• Absorbing nutrients

• Mixing food with gastric juices

In the experiment, what is added to one of the beakers containing starch solution?

• Saliva

• Salt

• Water

• Vinegar

What color change occurs in the solution with saliva after some time?

• It turns blue

• It remains violet

• It turns green

• It fades and turns white

What does saliva convert starch into during digestion?

• Proteins

• Vitamins

• Fats

• Small sugar molecules

Why can't starch be assimilated in the body as it is?

• It is too small

• It is a protein

• It is a polymer of glucose

• It is already in the blood

Where are the salivary glands located?

• Below the tongue

• In the stomach

• In the intestines

• Above the tongue

What enzyme in saliva helps break down starch?

• Amylase

• Lipase

• Protease

• Lactase

What is the primary role of amylase in digestion?

• Breaking down vitamins

• Breaking down starch to sugar

• Breaking down fats

• Breaking down proteins