All living things are made up of cells. In Multicellular organisms, cells get toghether in different types: muscle cells, nerve cells, bone cells, blood cells, etc. They make tissue:
BONE TISSUE
NERVE TISSUE
MUSCLE TISSUE
PLANT TISSUE
SKIN TISSUE
Organs are made of tissue. For example:
- muscle tissue is used to make the abdominal muscles, the biceps, the heart, the iris, etc.
- Nerve tissue is used to make the brain, the spinal cord, etc.