Unit 2 Lesson 4 Digestion in the Mouth. Mechanical Digestion: Is the process of breaking down food into smaller pieces. In the mouth, this is done by.

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Digestion in the Mouth When food is chewed and mixed with saliva, it turns into a moist ball called a bolus. There are three pairs of salivary glands that.

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Presentation transcript:

Unit 2 Lesson 4 Digestion in the Mouth

Mechanical Digestion: Is the process of breaking down food into smaller pieces. In the mouth, this is done by our teeth breaking and tearing food into smaller pieces.

Chemical Digestion Is the process of breaking the chemical bonds in nutrients and changing those nutrients into simple forms that can be absorbed into the bloodstream. It breaks down the food we eat into something the bloodstream can absorb.

Mechanical digestion helps prepare food for Chemical Digestion

Chemical digestion is facilitated _________________

Chemical digestion is facilitated by enzymes.

Enzymes are __________ produced by the body.

Enzymes are proteins produced by the body.

Amylase: A digestive enzyme that breaks down starch.

Saliva contains salivary ____________.

Saliva contains salivary amylase.

Salivary amylase: A digestive enzyme that starts the chemical digestion where starch is turned into a simple sugar.

Conditioned reflex for digestion in the mouth: This is when your mouth is conditioned to something that you associate with eating and it begins to salivate. To salivate means that your mouth fills with saliva (liquid produced by your salivary glands).

On average, how much saliva do we produce everyday? 1.5 liters

How many salivary glands to we have? 3 pairs (6 total)

What is a bolus? When food is chewed and mixed with saliva, it then turns into a moist ball. The moist ball is called bolus.

Where does digestion begin? Your mouth!!!!!!!!

What is the function of the epiglottis? Each time you swallow, the epiglottis closes the windpipe (trachea) so the food will go down the other tube in your throat (esophagus) to the stomach.

The trachea (windpipe) leads to where? The lungs

How many tubes do we have in our throats? 2 1 goes to the stomach (esophagus), the other goes to the lungs (trachea/windpipe).

The second organ of the digestive tract is the: Esophagus

The process of muscular contractions that push the food down the esophagus is called? Peristalsis

The esophagus leads to what organ? The stomach

What is a sphincter? A sphincter is a ring of muscle that helps keeps food moving in one direction down the digestive tract.