Draw the human respiratory system and label the following parts:
(a) Trachea
(b) Alveoli
(C ) Respiratory bronchioles
(d) Larynx.
Describe in brief the role of lungs in the exchange of gases.

Explanation

### Step-by-Step Solution:

1. **Draw the Human Respiratory System:**
- Start by sketching the overall structure of the human respiratory system. This includes the nasal cavity, trachea, bronchi, bronchioles, lungs, and diaphragm.

2. **Label the Parts:**
- **Trachea:** Label the trachea as the windpipe, which connects the throat (larynx) to the lungs.
- **Larynx:** Label the larynx, which is located just above the trachea and is known as the voice box.
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