The picture shows the structure diagram of the digestive system. Please answer the questions according to the picture: (1) The main organ for digesting food is ______ in picture 1 because it contains

The picture shows the structure diagram of the digestive system. Please answer the questions according to the picture: (1) The main organ for digesting food is ______ in picture 1 because it contains ___ in picture 2

(1) Number 6 in the picture is the small intestine, which is the main organ for digesting food. The small intestine has a large area for digestion and absorption; it is the longest in the digestive tract, about 5-6 meters long; there are many small intestinal villi on the inner surface of the small intestine; the small intestine contains bile secreted by the liver (c) in Figure 2, pancreatic juice secreted by the pancreas (e), and other Intestinal juice and other digestive juices secreted by the own glands; the villus wall and capillary wall of the small intestine are composed of only one layer of epithelial cells, which is conducive to the absorption of nutrients. Therefore, the small intestine is the main place for digestion and absorption.

(2) ①The main component of steamed buns is starch. Because there is salivary amylase in the mouth, starch begins to be initially digested in the first oral cavity of the human body.

② Eggs are rich in protein, and the final digestion products of protein are amino acids.

③The water, inorganic salts, and vitamins contained in food can be directly absorbed and utilized by the body without being digested.

④ Among the three students’ recipes, C is the most reasonable, because C is more nutritious and has a moderate content.

(3) No, this will cause malnutrition. You should strengthen exercise appropriately; pay attention to a balanced diet and don't eat too many sweets; the proportion of three meals a day should be appropriate.

So the answer is: (1) [6] small intestine; [c] liver; bile; [e] pancreas; pancreatic juice; intestinal juice.

(2) ① [1] Oral cavity; ② Amino acids; ③ Water, inorganic salts, vitamins; ④ C; C’s nutrition is relatively comprehensive and the content is relatively moderate (other reasonable answers are also acceptable) ．

(3) Incorrect; strengthen exercise appropriately; pay attention to a balanced diet and do not eat too many sweets; the proportion of three meals a day is appropriate (as long as the answer is reasonable).