SCIENCE

• Respiratory system


  Organ system in our body that helps us to breathe air in and out - supplying oxygen and eliminating carbon dioxide gases
• Two phases of breathing

  1. Inhalation

  2. Expiration
• Circulatory system


  The system in charge of transporting substances around the body
• Types of circulation

  • Pulmonary
  • Systematic
  • Coronary
• There are three types of blood vessels

  arteries, veins and capillaries.
• The four chambers of the heart

  right atrium, left atrium, right ventricle and the left ventricle.
• Symptoms are chest pain, shortness of breath, nausea and weakness or dizziness.

  Coronary heart disease
• Gregor Mendel's principle of inheritance

  the law of dominance, law of segregation and law of independent assortment
• The systematic tool that can be used in predicting the outcome of a given cross is called the punnett square. 


  . It was invented by Reginald Punnett.