How are respiratory gases transported in the human blood ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Respiratory Gases**: The primary respiratory gases in human blood are oxygen (O2) and carbon dioxide (CO2). Oxygen is essential for cellular respiration, while carbon dioxide is a byproduct of metabolic processes.

2. **Transport of Oxygen**:
- About 97% of oxygen is transported by red blood cells (RBCs).
- Within the RBCs, oxygen binds to hemoglobin, a red-colored iron-containing protein.
- Each hemoglobin molecule can bind to four oxygen molecules, forming a compound called oxyhemoglobin.
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