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Scientific Image - Human Venule

This is an optical microscope image of a human venule—a tiny blood vessel.

A venule is tiny blood vessel that connects capillaries—where the blood exchanges the oxygen it carries for carbon dioxide—to larger veins leading back to the heart.

• SIZE: A venule is about 30 µm in diameter.

• IMAGING TOOL: Optical microscope

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Scientific Image - Human Red Blood Cells (SEM)

Red blood cells carry a protein called hemoglobin which has a molecular structure adapted to transport oxygen to body tissues. This scanning electron micrograph shows the cells' characteristic donut-like shapes.

• SIZE: The typical diameter of a human red blood cell is 6-8 µm.

• IMAGING TOOL: Scanning electron microscope

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