Mouth

Definition

The mouth is the initial part of the digestive system where mechanical digestion through chewing and chemical digestion with saliva begin. It plays a crucial role in both nutrient intake and the initial breakdown of food substances.

5 Must Know Facts For Your Next Test

1. Saliva contains enzymes like amylase that start the process of breaking down carbohydrates.
2. The mouth's mucous membrane helps moisten food, making it easier to chew and swallow.
3. Teeth are essential for mechanically breaking down food into smaller pieces, increasing the surface area for enzyme action.
4. The tongue aids in mixing food with saliva, forming a bolus that is easy to swallow.
5. A healthy mouth is essential for proper nutrition as it affects the efficiency of digestion and nutrient absorption.

Review Questions

• What enzyme found in saliva begins the breakdown of carbohydrates?
• Why is mechanical digestion important in the mouth?
• How does the tongue contribute to the digestive process?

Related terms

Saliva: A digestive fluid produced by salivary glands that contains enzymes like amylase which initiate carbohydrate digestion.

Teeth: Structures in the mouth responsible for mechanically breaking down food into smaller pieces.

Tongue: A muscular organ in the mouth that assists in mixing food with saliva and forming it into a bolus for swallowing.