Here's a breakdown:
* Cells: The basic unit of life.
* Tissues: A collection of similar cells that work together to perform a specific function.
* Organs: Made up of different tissues working together to perform a more complex function.
* Organ Systems: A group of organs that work together to carry out major bodily functions.
* Organism: A complete living being made up of organ systems.
Examples of tissues:
* Epithelial tissue: Covers surfaces, lines cavities, and forms glands (e.g., skin, lining of the digestive tract).
* Connective tissue: Supports and binds other tissues (e.g., bone, cartilage, blood).
* Muscle tissue: Responsible for movement (e.g., skeletal muscle, smooth muscle, cardiac muscle).
* Nervous tissue: Transmits electrical impulses (e.g., brain, spinal cord, nerves).
