Tissues and Organs

• [Epithelia Tissue]

  • Tissues that line organs are called Epithelia Tissues
  • Ciliated Epithelium Cells have tiny hair-like projections called Cilia
  • Cilia are able to beat (wave backwards and forwards) to move liquids along

  
• [An Organ] A collection of different cell tissues carrying out a particular function
• [Tissues] Cells that have a similar function which are grouped together
• [Stem Cell] A cell that is able to divide many times by Mitosis, WITHOUT undergoing differentiation. Later, it can differentiate into Specialised Cells such as Muscle or Nerve cells
• Two main types of Stem Cells in Humans:

  • [Embryonic stem cells] found in the early stages of development of an Embryo. They can differentiate into ANY type of BODY Cell
  • [Adult stem cells] found in certain Adult Tissues, such as Bone Marrow, and the lining of the Intestine. They DON'T have the ability to differentiate into ANY type of Cell, but can form a number of specialised Tissues

  ---> For example, Bone Marrow cells can divide many times, but are only able to produce different types of Red and White Blood cell.
• [Stem Cell Therapy] The use of Stem Cells to treat or prevent a Disease, OR to repair damaged Tissues