levels of organisation

• organs work together to form an organ system
• cells group together to form a tissue
• systems group together to form an organism
• tissues group together to form an organ
• Cells form tissues, tissues form organs, organs form organ systems, and organ systems form organisms
• The spinal cord is part of the nervous system
• the mouth is part of the digestive system
• The kidneys are part of the urinary system
• The heart is part of the circulation system
• our bones and muscles are called the musculoskeletal system
• the digestive system breaks down and absorbs food
• The circulation system transports substances around the body
• The nervous system helps us to react with our surroundings
• musculoskeletal system supports the body and makes it move
• the reproductive system allows new babies to be conceived
• the breathing system takes in air to allow gases to be exchanged
• the urinary system removes poisons and excess water
• an organism with many cells is said to be multicellular
• to be able to perform different functions, cells are said to differentiate
• a tissue is a group of cells
• in a tissue, each cell has a similar structure and function
• muscular tissues contract to bring about movement
• glandular tissues produce substances such as hormones and enzymes
• epithelial tissues cover some parts of the body
• organs are made of tissues
• one organ can contain several tissues
• the stomach is an example of an organ
• the stomach contains muscular tissue to churn food
• the stomach contains glandular tissue to produce digestive juices
• the stomach contains epithelial tissue to cover the inside and outside of the stomach
• organ systems are groups of organs that work together to perform a specific function.
• an example of an organ system is the digestive system