Organelles
- Have a specific function inside the cell
- Made up of small molecules
- Example: mitochondria, ribosomes, etc.
Cells
- The basis of all living things
- Said to be a functional unit
- Made up of organelles
- Examples: red blood cells, white blood cells, etc.
Tissues
- Made up of many cells
- Cells serve a common function
- Examples: muscle tissue, neural tissue
Organs
- Made up of tissues
- Form a large functioning unit
- Examples: liver, heart, etc.
Organ systems
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