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