Cell organisation

• Large multicellular organisms are made up of organ systems
• Cells are the basic building blocks that make up all living organisms
• Specilalised cells carry out a particular function
• The process by which cell become specialised for a particular job is called differentiation
• Differentiation occurs during the development of a multicellular organism
• Specialised cells form tissues, which form organs, which form organ systems
• Similar cells are organised into tissues
• A tissue is a group of similar cells that work together to carry out a particular function. It can include more than 1 type of cell
• Muscular tissue, which contracts (shortens) to move whatever it's attached to
• Glandular tissue, which makes and secretes chemicals like enzymes and hormones
• Epithelial tissue, which covers some parts of the body e.g. the inside of the gut
• Tissues are organised into organs
• An organ is a group of different tissues that work together to perform a certain function
• Stomach - muscular tissue, shich moves the stomach wall to churn up the food
• Stomach - glandular tissue, which makes digestive juices to digest food
• Stomach - epithelial tissue, which covers the outside and inside of the stomach
• Organs are organised into organ systems
• An organ system is a group of organs working together to perform a particular function
• The digestive system (found in humans and other animals) breaks down and absorbs food
• Digestive system - glands (e.g. pancreas and salivary glands)< which produce digestive juices
• Digestive system - The stomach and small intestine, which digest food
• Digestive system - The liver, which produces bile
• Digestive system - The small intestine, which absorbs soluble food molecules
• Digestive system - The large intestine, which absorbs water from undigested food, leaving faeces
• Organ systems work together to make entire organisms