What part of the digestive system first causes chemical changes to food?
A. teeth in the mouth
B. saliva in the mouth
C. enzymes in the stomach
D. enzymes in the small intestine

Answer:

b. saliva in the mouth

Explanation:

saliva contains enzymes that help break down food

Saliva in the mouth causes the first chemical changes in the food. So the correct option is B.

Saliva is a continuously present, viscous, colorless, opalescent fluid in the mouths of humans and other animals. It is made up of amylase, water, mucus, proteins, and mineral salts.

Saliva takes up food particles, bacterial cells, and white blood cells as it moves about in the oral cavity. Every day, a person's mouth excretes one to two liters of fluid.

The total amount of saliva is produced by three primary pairs of salivary glands as well as numerous smaller glands that are dispersed across the has included of the cheeks, lips, tongue, and palate.

The mouth naturally produces small amounts of saliva on a regular basis, but the introduction of food, or even just the scent or idea of it, will significantly enhance saliva production.

Salivation serves a variety of purposes. In order to aid in speaking and transform foodstuffs into a liquid or semisolid material that can be tasted and taken more readily, it primarily lubricates and moistens the interior of the mouth.

Therefore the correct option is B.

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Which type of fertilization and development occurs
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inertia
mass
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B.
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True

False

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True

False

3.)
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True

False

4.)
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increases the salinity of the water in an area

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rivers

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True

False

10.)Black sand can be found when

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sediment contains volcanic ash

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O

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