Human Body

4. proteins produced by the immune system in response to specific antigens
5. chemical messengers secreted by glands that aid in cell to cell communication
9. human body system designed to transport molecules throughout the body
11. Protein molecules found on the cell membranes of pathogens and provoke an immune response
13. human body system designed to protect the body from harmful pathogens
15. regulation mechanisms that work to maintain homeostasis in an organism
16. Specifically-shaped protein molecules on a cell membrane that receive signals from outside the cell
18. A condition caused by HIV characterized by a severely weakened immune system
19. blood cell that transports oxygen throughout the body
20. small cell fragments in the blood that help in blood clotting
22. human body system designed for control and coordination of the organism
25. the body's response to a substance that it mistakenly identifies as harmful
26. human body system of glands that produce and secrete hormones

1. A hormone produced and released by the pancreas to raise blood sugar
2. harmful microorganisms
3. human body system designed to break down food into nutrients
6. A virus that attacks the immune system, killing white blood cells and weakening the immune system
7. The molecule that diffuses from the blood to the lungs to be exhaled
8. main organ of the nervous system
10. steady internal state of an organism
12. human body system designed to remove waste products from the body
13. A hormone produced and released by the pancreas to lower blood sugar
14. main organ of the cardiovascular system
16. human body system designed to take in oxygen and remove carbon dioxide
17. organ that produces and secretes insulin and glucagon
20. liquid portion of human blood
21. main organ of the respiratory system
23. The molecule that diffuses from the lungs to the blood to be transported to the body cells that need it
24. blood cell that is part of the circulatory system and immune system