how can we see veins if they are so small?

Question: how can we see veins if they are so small?
- Keywords:
  physiology,
  size,
  veins
Asked by menu520phew to Chloe L, charlotteslade on 3 Apr 2025.
- Charlotte Slade answered on 3 Apr 2025:
  
  That’s a great question!
  
  Our eyes are amazing, but they can only see things down to a certain size. Veins are small, but they’re still big enough for us to see, especially the ones closer to the surface of our skin. The blood flowing through them also helps make them more visible.
  
  But to see REALLY tiny things, like cells or even atoms, we need special tools like microscopes. They’re like super-powered magnifying glasses that let us explore the invisible world!

Question: how can we see veins if they are so small?