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Across 4. an insoluble storage carbohydrate 5. a change in the environment, involving energy 9. glucagon is released by ............ cells 10. a control mechanism where movement away from the normal value of something produces a response that returns it to its normal value 11. insulin is secreted by ......... cells 12. a reflex is an ............................. response 13. two hormones that control blood sugar concentrations 14. where are the hormones released from 15. blood sugar ........... after a meal

Down 1. process by which glucose enters cells 2. high glocose levels in the blood 3. low glucose levels in the blood 6. breakdow of glycogen to glucose 7. glucose to glycogen 8. maintaining a stable environment inside to achieve an optimum metabollic rate