AQA Biology Paper 2

5. The process that releases energy from glucose
6. An enzyme that breaks down starch into sugars
9. An organ that produces digestive enzymes and hormones
12. A neurone that carries impulses from receptors to the central nervous system
13. A hormone that lowers blood glucose concentration
14. A muscle or gland that responds to a stimulus
17. A fatty layer that insulates neurones and speeds up impulses
18. A specialised cell that transmits electrical impulses
20. An enzyme that breaks down proteins into amino acids
23. A finger-like projection in the small intestine that increases surface area for absorption
24. A junction between two neurones where signals are transmitted by neurotransmitters

1. A cell or organ that detects a stimulus
2. An enzyme that breaks down lipids into fatty acids and glycerol
3. A reaction to a stimulus
4. A substance that increases the rate of a reaction without being used up
7. The breakdown of large insoluble molecules into small soluble molecules
8. A hormone that increases blood glucose concentration
10. A long part of a neurone that carries electrical impulses away from the cell body
11. A protein that speeds up chemical reactions in living organisms
12. A change in the internal or external environment detected by receptors
15. The control of body temperature within narrow limits
16. The pathway followed by nerve impulses during a reflex action
19. The regulation of internal conditions to maintain a stable environment
21. A substance made by the liver that neutralises stomach acid and emulsifies fats
22. A chemical messenger carried in the blood to target organs