What are the three substances secreted by various cell that found in with gastric pit area of stomach?

Three substances secreted by various cells found within gastric pit area of stomach are:

1. Mucus: This is a thick, viscous fluid that is secreted by the surface mucous cells. It helps to protect the stomach lining from the acidic environment and provides lubrication for food movement.

2. Hydrochloric acid: This is a strong acid that is secreted by the parietal cells. It helps to kill bacteria and denature proteins in food, making them more digestible.

3. Pepsinogen: This is an inactive enzyme that is secreted by the chief cells. It is converted into its active form, pepsin, by the acidic environment of the stomach. Pepsin helps to break down proteins into smaller peptides.