The great B1-revision crossword challenge.

3. The chemical substances secreted from glands into the bloodstream.
6. Muscles of glands that carry our response in the nervous system.
9. A diet containing the right amount of energy and enough of each nutrient.
10. A type of immunity in which you make your own antibodies.
11. A type of immunity in which you need to be injected with antibodies.
12. A type of white blood cells which produce the antibodies and antitoxins.
13. The diseases which are caused by microbes and can be easily pass on from one person to another.
14. A type of white blood cells which engulf the pathogens.
16. The response of a plant to light.
19. A type of drugs which include temazepam and alcohol.
20. Two different versions of the same genes.
21. The disease-causing microorganisms are called...
24. The name of the cells building the nervous system.
25. The type of vision in which the two eyes are facing forward.
26. The spontaneous changes in DNA structure.

1. The cells in our body which keep on dividing and form an abnormal mass.
2. The tumour which doesn't spread to other parts of the body.
3. The balancing of inputs and outputs in your body in order to maintain constant internal environment.
4. The photo-sensitive layer of tissue at the back of your eye.
5. The hormone which regulates blood glucose level.
7. The cell which can detect stimuli - a part of the nervous system.
8. A type of drugs which include cannabis and LSD.
14. The part of the eye which shrinks when exposed to the source of direct light.
15. The knee-jerk reflex is an example of ______ action.
17. The tumour which spreads to other parts of the body.
18. The response of a plant to gravity.
22. The particular regions of chromosomes which code information about specific proteins 'paragraphs'.
23. The abbreviation of deoxyribonucleic acid.