Question

the fingerlike shape of the villi is very important for nutrient absorption because it increases the surface area of the small intestine. in celiac disease, the villi flatten, decreasing the surface area of the small intestine. as a result, fewer nutrients get absorbed. also, the model shows that celiac disease damages the epithelial cells of the villi. the epithelial cell layer is important for the diffusion of nutrients to the capillaries. without a healthy epithelial cell layer, fewer nutrients may be absorbed, and the body may not have enough energy to perform its functions.
part b
explain why the symptoms of celiac disease are consistent with the effects of celiac disease on the small intestine.

Explanation:

Celiac disease damages the villi (finger - like structures in the small intestine) and the epithelial cell layer. Villi increase the surface area for nutrient absorption. When they are damaged, the surface area for absorption decreases. Fewer nutrients (like glucose, amino acids, fats, vitamins, and minerals) are absorbed into the bloodstream. The body needs these nutrients for energy production (through processes like cellular respiration) and to carry out various functions (such as growth, repair, and maintaining organ function). If there is insufficient nutrient absorption, the body doesn't get enough energy and essential substances. This leads to symptoms like fatigue (due to lack of energy), weight loss (as the body may break down its own tissues for energy), abdominal pain (due to improper digestion and intestinal irritation), and nutrient - deficiency - related issues (like anemia from lack of iron or vitamin B12 absorption).

Answer:

Celiac disease damages the villi and epithelial layer of the small intestine, reducing nutrient absorption surface area. Fewer nutrients (for energy/function) are absorbed, causing symptoms like fatigue, weight loss, abdominal pain, and nutrient - deficiency - related issues, as the body lacks energy and essential substances for normal functioning.