Ins and Outs - Cells

• In an adult human's body – contains billions of cells.
  
• Egg Cells – beginning of the baby – is a largest cells – 0.2mm, is about size of the dot of "i".
  
• Brain Cells – is a smallest cell – 0.005 mm.
  
• A Cells is surrounded by cell wall – allows substances to move in and out the cell.
  
• A Cells – filled with jelly-like substance - cytoplasm – contains everything the cell needs to stay alive
  
• At centre of the cells
  – nucleus – provides all the instructions the cell needs to do it task properly.
  
• The detailed instructions – contained in complicated string of chemical – chromosomes.
  
• Except egg cells and sperm cells – all cells contain 46 chromosomes.
  
• Egg and sperm cells – contain 26 chromosomes.
• Chromosomes – made of a complicated chemical called deoxyribonucleic acid (DNA).
  
• DNA – like spiral ladder – made of small unit called genes.
  
• Genes –
  carry the genetic information that determines exactly what we look like.