Cell organisation

• What are the basic building blocks that make up all living organisms?

  Cells
• What is the function of specialised cells?


  They carry out a particular function.
• What is the process by which cells become specialised for a particular job?

  Differentiation
• When does differentiation occur in multicellular organisms?


  During the development of a multicellular organism.
• How are specialised cells organised in multicellular organisms?


  • Specialised cells form tissues
  • Tissues form organs
  • Organs form organ systems
• What is a tissue?


  A group of similar cells that work together to carry out a particular function.
• Can a tissue include more than one type of cell?


  Yes, it can include more than one type of cell.
• What are examples of tissues in mammals?

  Muscular tissue, glandular tissue, epithelial tissue.
• What is the function of muscular tissue?


  It contracts to move whatever it’s attached to.
• What does glandular tissue do?


  It makes and secretes chemicals like enzymes and hormones.
• What is the role of epithelial tissue?


  It covers some parts of the body, e.g., the inside of the gut.
• What is an organ?


  An organ is a group of different tissues working together.
• What tissues make up the human stomach?

  Muscular tissue, glandular tissue, epithelial tissue.
• What is the function of the stomach as an organ?


  It churns up food and digests it.
• What is an organ system?


  An organ system is a group of organs working together to perform a particular function.
• What is the function of the digestive system?


  It breaks down and absorbs food.
• What organs make up the digestive system?


  Glands, stomach, small intestine, liver, large intestine.
• What is the role of glands in the digestive system?


  They produce digestive juices.
• What does the stomach do in the digestive system?


  It digests food.
• What is the function of the liver in the digestive system?


  It produces bile.
• What is the role of the small intestine in digestion?


  It absorbs soluble food molecules.
• What does the large intestine do?


  It absorbs water from undigested food, leaving faeces.
• How are cells, tissues, organs, and organ systems organized in multicellular organisms?


  • Cells are organized into tissues
  • Tissues are organized into organs
  • Organs are organized into organ systems
  • Organ systems make up the whole organism