Explanation:

Some Researchers have developed a new way of growing realistic human tissues outside the body.

Their “person-on-a-chip” technology, called AngioChip, is a tool for discovering and testing new drugs, and could eventually be used to repair or replace damaged organs.

These tiny polymer scaffolds contain channels that are about 100 micrometres wide, about the same diameter as a human hair.
When seeded with cells, the channels act as artificial blood vessels