How cells make a body (Tissues)

• What are Tissues?

  A group of cells that are similar in structure and that work together to carry out a particular task.

  Can be classified into four basic types of tissues:

  Epithelial, connective, muscular, and nervous
• Epithelial Tissue: The lining/covering tissue. 


  Outer layer of skin, the inside and outside of hollow organs are made up of epithelium.

  The cells that make up epithelium are very closely joined together; forming a smooth surface.
• Connective Tissue: provides support and connection.


  Cells are not closely joined together; separated by non-cellular material called 'matrix'.

  Includes bone, cartilage, ligaments and fat storage
• Muscular Tissue: Contracts (either voluntarily or involuntarily) to produce movement and force.


  There are three type of muscular tissue: Smooth, Cardiac, and Skeletal
• Skeletal muscles are attached to the bone by tendons.

  Voluntary muscles, as we have control over these parts that we can move when needed.
• Why are epithelia tissues so closely packed together?

  To create a protective barrier for our bodies.
• Differences between muscle tissues?

  Skeletal: striated columns, voluntary

  Cardiac: Striated, involuntary

  Smooth: Non-striated, involuntary