The experiments of pancreatectomy, pancreatic preparation injection and feeding animal pancreatic confidants were carried out in dogs. Please analyze the following experimental phenomena and reasons.

1. After pancreatectomy, the change of urine composition in dogs is that glucose appears in urine, which is the symptom of diabetic patients. What effect does it have on the digestion of dogs? It will affect the dog's function of regulating blood sugar content, but it will not affect digestion. The reason for this effect is that islets secrete a substance that can regulate blood sugar content.

2. Inject animal pancreatic preparation every day for pancreatectomy. The change of urine composition in dogs is that there is no glucose in urine. What effect does it have on the digestion of dogs? It has no effect on the digestion of dogs, because the islets secrete a substance that can regulate the blood sugar content, namely insulin.

3. After giving pancreatectomy dogs a proper amount of pancreatic preparation every day, the change of dog urine composition is that glucose appears in urine. Does it affect the digestion of dogs? It didn't work. The reason is that insulin belongs to protein. After entering the digestive tract, it will be laughed at by digestive enzymes in the stomach, so it has no effect on sugar metabolism.

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