In the tissues, they become tiny capillaries.

Blood-beads had seeped from tiny capillaries in the butterfly's wings.

Recent research would make it seem that the floaters are red blood corpuscles that occasionally escape from the tiny capillaries in the retina.

But we'll also look inside the alveoli of his lungs, and the tiny capillaries of his fingertips.

The entire circulatory system, down to the tiniest capillaries, can be examined at full scale.

This occurs when the tiny capillaries in the tip of your fingers bleed between the nail and the skin under the nail.

His cheeks bulged out and just beneath the skin there was a fine network of tiny red capillaries.

Suppose the tendon had stretched for so long it couldn't tauten, or the muscle was shrunk so dry its tiny capillaries were flat and empty.

The blood then goes into tiny capillaries that are in contact with small tubes within the glands.

The blood travels in the arteries to the smaller arterioles and then, finally, to the tiny capillaries which feed each cell.