Proventriculus

Definition

The proventriculus is a glandular part of the stomach in birds that secretes digestive enzymes. It plays a crucial role in the initial stages of food digestion before it moves to the gizzard for further breakdown.

5 Must Know Facts For Your Next Test

1. The proventriculus produces hydrochloric acid and pepsinogen to aid in protein digestion.
2. It is located between the esophagus and the gizzard in bird anatomy.
3. Unlike mammals, birds have a two-part stomach system, with the proventriculus being one part and the gizzard being the other.
4. The proventriculus is sometimes referred to as the 'true stomach' of birds due to its enzyme-secreting function.
5. In some bird species, such as raptors, the proventriculus also helps regurgitate indigestible parts of their prey.

Review Questions

Related terms

Gizzard:

A muscular part of a bird's stomach that grinds food, often aided by ingested stones.

Hydrochloric Acid: An acidic substance produced by glands in the stomach lining, essential for breaking down food.

Pepsinogen: An inactive enzyme secreted by stomach cells that converts into pepsin when exposed to stomach acid.