1.3 From Cells to Tissues: How Living Structures Are Formed

Organs are not made of single cells but of organized tissues. Cells communicate, align, and connect to form structures that can perform specific functions.
For example:

  • heart muscle cells must contract together,
  • blood vessels must deliver oxygen and nutrients,
  • tissues must survive and adapt in a living environment.


This process shows that structure and function are closely linked in biology—a key challenge when trying to recreate organs in the laboratory.