Name all enzymes involved in the digestive process, where are produced, and specify their action within the food ingested

Name all enzymes involved in the digestive process, where are produced, and specify their action within the food ingested.

2.- Name the hormones involved in the digestive process, where are produced, and their action.

3.- Vitamin B12 is necessary in the production process of the Hemoglobin.

A deficiency of Vitamin B12 lead into a well described type of anemia, please name it.

Why patients after a gastrectomy develop that type of anemia?

How would you treat this specific anemia?