AP BIOLOGY

Detailed explanation-1: -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-2: -Pigs have genetic and physiological traits similar to humans, which make them one of the most useful and versatile animal models. Owing to these similarities, data generated from porcine models are more likely to lead to viable human treatments than those from murine work.

Detailed explanation-3: -The pig stomach is two to three times larger and the cardiac mucosa occupies a greater portion of the stomach compared to the human stomach. Both gastric and pyloric mucosa contain parietal and chief cells. The cardiac cells secrete mainly mucus.

Detailed explanation-4: -Pigs have significant anatomical and physiological similarity with human beings, with some key comparisons noted in Table 2 and Figure 1. The structure of the small intestine is very similar in humans and pigs, including macroscopic features such as the ratio of intestinal length per kilogram bodyweight (Table 2) (19).