A six day old human embryo.
The surface of the small intestine.
Purkinje neurons in your brain, these cells control motor coordination.
Blood vessels in the retina of the eye.
Red blood cells.
Alveoli, the center for gas exchange with your blood, on the inner surface of your lungs.
A blood clot consisting of red blood cells, fibrin and a white blood cell in the middle.
All images are borrowed from Wellcome images