cells

• Plant cell

  
• Animal cell

  
• • Tissue - a group of similar cells with similar functions, bone, muscle, xylem
  • Organ - collection of two or more tissues that perform specific functions, kidney, flower, brain
  • Organ system - collection of several organs that work together, digestive system, respiratory system
  • Organism - whole animal or plant, human, tree
• Plant and animal cells:

  Cell membrane - controls the movement of substances into and out of the cell

  Cytoplasm - where chemical reactions happen

  Nucleus - genetic information, controls cells activities

  Mitochondria - supplies cells with energy from aerobic respiration

  vacuole - contains cell sap, keeps cell firm

  Cell wall - made cellulose, supports cell, structure

  Chloroplasts - green chlorophyll, absorbs light energy, photosynthesis occurs here
• Specialized cells and differentiation:

  features modified or adapted to suit specific function and perform job efficiently

  • sperm cell has a tail and lots of mitochondria
  • palisade cell packed with chloroplasts for photosynthesis