# Wikijunior:Biology/Tissues


! Animal muscle
tissue

## Tissues

Organisms are made of tissues. Tissues are groups of
cells that work together. Plant leaves
have tissues that capture light and make sugar. Most animals have
**muscle** tissues that help them move.

When two or more tissues work together to do one thing, they make up
organs.

In plants, there are two types of tissues:

-   **Meristematic tissue**: This has actively dividing cells.
-   **Permanent tissue**: This type of tissue has developed cells. They
    do not divide.

There are also two different types of permanent tissue:

-   **Simple permanent tissue**: This type of permanent tissue has only
    one kind of cells. Some examples of simple permanent tissues are:
    -   **Parenchyma**: They have loosely packed cells. The cells do not
        have a particular function.
    -   **Collenchyma**: They have cells which have layers called
        pectin. They contain chlorophyll.
    -   **Sclerenchyma**: They have dead cells. Between the cells, there
        are layers called lignin.
-   **Complex permanent tissue**: This type of permanent tissue contains
    different kinds of cells. Some examples of complex permanent tissues
    are:
    -   **Xylem**: This type of tissue contains mainly dead cells. They
        help to move water from the roots to leaves.
    -   **Phloem**: This type of tissue contains mainly living cells.
        They help moving food materials from leaves to other parts.

