VI) The Immune System and VII) the circulatory system

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Across
  1. 4. structures that veins and arteries branch into.
  2. 7. is a chemical marker on a cell's surface that indicates whether the cell is from the body or is a foreign material.
  3. 8. a component of blood that helps the body fight infections.
  4. 9. moves through the body delivering oxygen and other materials to cells.
Down
  1. 1. picks up oxygen in the lungs and transports it throughout the body.
  2. 2. a medication that blocks the growth and reproduction of bacteria
  3. 3. contains a small amount of weekend or dead pathogens that stimulate an immune response.
  4. 4. transports material from the digestive and the respiratory system to cells.
  5. 5. resistance to a sickness.
  6. 6. a disease-causing agent.