AP BIOLOGY

Detailed explanation-1: -Food digestion begins in the mouth of the pig. Food is chewed into smaller pieces and mixed with saliva so that it is easier to swallow. As food is swallowed, food moves down the esophagus and into the stomach. Once in the stomach, the food is mixed with more enzymes to help break down the food.

Detailed explanation-2: -The pig has a digestive system which is classified as monogastric, or nonruminant. Humans also have this type of digestive system. They have one stomach (mono = one, gastric = stomach). The monogastric differs from that of a polygastric, or ruminant, digestive system found in cattle and sheep.

Detailed explanation-3: -Abstract. Studies on enzyme digestion in the precaecal part of the digestive tract show that the pig posesses digestive enzymes that can completely break down dietary substrates to absorbable nutrients.

Detailed explanation-4: -Stomach acidity in young pigs begins at moderate levels and remains relatively high until after weaning, whereas a lower post-weaning pH is required for maximal protein digestion and gut health. Stomach pH in mature animals is controlled by secretion of hydrochloric acid from gastric mucosa.