Across
- 6. a lymphocyte able to bind to certain tumor cells and virus-infected cells without the stimulation of antigens, and kill them by the insertion of granules containing perforin
- 8. a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white blood cell
- 9. a lymphoid organ situated in the neck of vertebrates that produces T cells for the immune system
- 11. the thin layer of tissue forming the natural outer covering of the body of a person or animal
- 13. the stomach or belly
- 14. an abdominal organ involved in the production and removal of blood cells in most vertebrates and forming part of the immune system
- 18. A small bean-shaped structure that is part of the body's immune system
- 20. part of the body's immune system. They help the body fight infection and other diseases
Down
- 1. A special type of immune cell that is found in tissues and boosts immune responses by showing antigens on its surface to other cells of the immune system
- 2. a large phagocytic cell found in stationary form in the tissues or as a mobile white blood cell, especially at sites of infection
- 3. A Body System That Fights Diseases
- 4. A type of white blood cell that makes antibodies
- 5. a basophilic white blood cell
- 7. an epithelial tissue which secretes mucus, and lines many body cavities and tubular organs including the gut and respiratory passages
- 10. The soft, spongy tissue that has many blood vessels and is found in the center of most bones
- 12. a neutrophilic white blood cell
- 15. a white blood cell containing granules that are readily stained by eosin
- 16. a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting
- 17. cells with the potential to develop into many different types of cells in the body
- 19. help protect the body from infection and may help fight cancer