Cells

• Cells


  Smallest unit of life
• Cell structure


  • Nucleus
  • Cell wall
  • Cytoplasm
  • Cell membrane
  • Chloroplasts
  • Vacuole
  • Mitochondria
• Nucleus


  Control centre of cell containing the genetic information (DNA)
• Cell wall


  Rigid structure made of cellulose to support the cell & help keep its shape
• Cytoplasm


  Jelly like substance where cells chemical reactions take place
• Cell membrane


  Barrier surrounding the cytoplasm which helps control what enters and leaves the cell
• Chloroplasts


  Containing the pigment chlorophyll that traps light for photosynthesis
• Vacuole


  Fluid filled space containing cell sap
• Mitochondria


  The site of all respiration
• Cells are the smallest unit of life
• The study of cells is called cytology
• Large numbers of identical cells that have the same structure and function are grouped together to form a tissue
• Different tissues are grouped together to form organs
• Organ systems are made up of large numbers of organs that work together
• Organ systems


  • Digestive
  • Respiratory
  • Circulatory
  • Excretory
  • Reproductive
  • Nervous
  • Skeletal
• Organ systems function to support, protect, and maintain the body
• Organisms are made up of organ systems
• Cells


  Work together in tissues
• Tissues


  Work together in organs
• Organs


  Work together in organ systems
• Organ systems


  Work together in organisms
• digestive system

  • Main organs: teeth, stomach, intestines
  • function: breaks down and absorbs molecules from food
• Respiratory system

  • main organs : trachea, ribs, lungs, bronchi
  • function : gaseous exchange
• skeletal system

  • main organs : backbone, ribs
  • function : support, movement and protection
• circulatory system

  • main organs : heart, blood vessels
  • function : transports material around the body
• excretory system

  • main organs : bladder, liver, kidneys
  • function : removal of waste
• reproductive system

  • main organs : ovaries
  • function : production of sex cells and fertilisation
• nervous system

  • main organs : brain, spinal cord
  • function : respond to stimuli and coordination of response