What are the different parts of human body involved in human digestion and mention their function?

Explanation

### Step-by-Step Solution:

1. **Mouth (Buccal Cavity)**:
- **Function**: The digestion process begins in the mouth where food is mechanically broken down by chewing. Saliva, produced by salivary glands, mixes with the food to help in its movement towards the pharynx. Saliva contains enzymes that start the chemical breakdown of carbohydrates.

2. **Pharynx**:
- **Function**: The pharynx acts as a pathway for the food to move from the mouth to the esophagus. It plays a role in swallowing.

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