Biology Crossword Puzzle

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Across
  1. 1. T Cells divide and differentiate into memory cells and into effector cells that help activate cytotoxic T and B cells
  2. 4. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus
  3. 6. is the entrance of food in the digestive tract
  4. 7. when dehydrated these receptor cells in hypothalamus to send impulses in the posterior pituitary gland
  5. 11. are predators or scavengers that eat the flesh of other animals
  6. 12. is an immune reaction to a harmless substance
  7. 14. the 3rd stage where the nutrients enter the cells lining the digestive tract and move into the bloodstream to be transported
  8. 19. any molecule that stimulates an immune reaction by B and T cells
  9. 20. is a condition in which the immune system lacks one or more essential components.
  10. 25. the chamber in heart where blood exits
  11. 26. the protein that carries oxygen
  12. 27. is a substance that stimulates active immunity against a pathogen without causing illnesses
  13. 28. is the liquid matrix of blood
Down
  1. 2. is the elimination of theses metabolic wastes
  2. 3. the most common measure, is equal to weight/height^2
  3. 5. are Y-shaped proteins that recognize specific antigens.
  4. 7. a reaction in which the cells clumped together
  5. 8. an organ is a pump that keeps the blood moving through these vessels
  6. 9. also known as a leukocyte which are suspended in blood plasma and occupy the interstitial fluid between cells
  7. 10. the colorless fluid of the lymphatic system, forms when plasma seeps out of blood vessel into intestinal fluid
  8. 13. Juice a mixture of water, mucus, salts, hydrochloric acid, and enzymes
  9. 15. is an immediate, localized reaction to an injury or to any pathogen that breaches the body's barriers
  10. 16. substances required for metabolism, growth, maintenance, and repair
  11. 17. is the fluid of the circulatory system
  12. 18. are saucer-shaped disks that participate in the exchange of oxygen and carbon dioxide
  13. 21. are small, colorless cell fragments that participate in blood clotting
  14. 22. small intestine's lining; tiny fingerlike projections that absorb nutrients
  15. 23. cancers in which bone marrow overproduces white blood cells
  16. 24. uses inorganic raw materials like water and carbon dioxide to make its own food.
  17. 27. Cava a large vein carrying deoxygenated blood into the heart