cell organisation

• A tissue is a group of similar cells that work together to carry out a particular function. It can include more than one type of cell
• In mammals examples of tissues include:

  1. muscular tissue which contracts to move whatever its attached to
  2. glandular tissue which makes and secretes chemicals like enzymes and hormones
  3. epithelial tissue which covers some parts of the body e.g the inside of the gut
• An organ is a group of different tissues that work together to perform a certain function.
• the stomach is an organ made up of:

  1. muscular tissue which moves the stomach wall to churn up food
  2. glandular tissue makes digestive juices
  3. epithelial tissue covers inside and outside
• An organ system is a group of organs working together to perform a particular function