In biology, the most prominent example of something red is red blood cells, also known as erythrocytes.
Red Blood Cells (Erythrocytes)
Red blood cells are responsible for carrying oxygen throughout the body. Their red color comes from hemoglobin, a protein that binds to oxygen. Each cubic millimeter of blood contains 4-6 million of these tiny cells (approximately 6 µm in diameter), small enough to navigate even the narrowest blood vessels.
- Function: Oxygen transport.
- Color Source: Hemoglobin.
- Size: Approximately 6 µm in diameter.
- Abundance: 4-6 million per cubic millimeter of blood.
