B3

• Tissue


  A group of cells with similar structure and function working together
• Organ


  A collection of tissues performing a specific function
• Specialised cell, tissue, or organ

  • Sperm
  • Kidney
  • Stomach
• Sperm


  • Specialised cell
• Kidney


  • Organ
• Stomach


  • Organ
• Stomach's role in digestion of food

  1. Contains muscular tissue to churn food and digestive juices

  2. Contains glandular tissue to produce digestive juices

  3. Contains epithelial tissue to cover inside and outside

  4. Adaptations to increase surface area

  5. Rich blood supply for exchange
• Larger multicellular organisms have many levels of organisation
• Organ systems are groups of organs that work together to perform specific functions
• The way one organ functions often depends on other organs in the system
• Organ systems work together to form organisms
• Organ systems in the human body

  • Digestive system
  • Circulatory system
  • Gas exchange system
• Organ systems have adaptations in some of their organs to make them effective as exchange surfaces