The Body Systems

• Cells: Basic units of living things

  Tissues: Made up of cells

  Organs: Made up of tissues

  Organ system: Made up of organs
• Blood: Liquid that carries oxygen, wastes and chemicals through the body
• Blood vessels: Tubes that carry blood around the body and back to the heart.
• Arteries: Carry blood away from the heart
• Heart: Pumps blood through vessels
• How do the lungs deoxygenate blood?

  Pulmonary capillaries
• What are the 4 parts of the heart?

  Right atrium, left atrium, right ventricle, left ventricle
• Capillaries: Very small blood vessels that connect arteries and veins.
• The heart rate increases when you exercise because it needs to pump more blood around the body to give your muscles more energy.