What is the appearance of stomach mucosa after ingestion of carbonic acid?

The appearance of the stomach mucosa after ingestion of carbonic acid is typically red. Carbonic acid, which forms when carbon dioxide dissolves in water, can irritate the mucosal lining of the stomach, leading to inflammation and a reddened appearance.

The mucosal damage from carbonic acid ingestion may present as erythema due to the influx of blood to the affected area in response to irritation. This inflammatory response results in redness, which is consistent with the physiological reaction to an irritant.

The yellow, black, and pale options do not accurately represent how the stomach mucosa reacts to carbonic acid ingestion. Yellow would generally indicate jaundice or increased bilirubin levels, black may suggest the presence of older blood or melena, and pale could indicate a lack of blood flow or anemia. However, the immediate and typical response following such irritation from carbonic acid is redness.