As shown in the schematic diagram of human digestive system, fill in the blanks in the schematic diagram (fill in the serial number in [] and fill in the name on the horizontal line): (1) The digestiv

As shown in the schematic diagram of human digestive system, fill in the blanks in the schematic diagram (fill in the serial number in [] and fill in the name on the horizontal line): (1) The digestive system of human body consists of _ _ _ _ and _ _ _ _ _ (1) The digestive system consists of digestive tract and digestive glands. The digestive tract consists of mouth, pharynx, esophagus, stomach, small intestine, large intestine and anus, and it is the channel of digestion. Digestive glands include salivary glands, stomach glands, intestinal glands, pancreas and liver.

(2)[4] The liver is the largest digestive gland in the human body and can secrete bile. Secreted bile is temporarily stored in gallbladder [5] and enters duodenum through bile duct. Bile does not contain digestive enzymes, which can emulsify fat into fat particles and promote the digestion of fat.

(3)[9] The small intestine is the longest section of the digestive tract, with folds and villi on it. Small intestine wall, capillary wall and villi are all composed of only one layer of epithelial cells, which is beneficial to the absorption of nutrients. Small intestine is the main place for digestion and absorption.

So the answer is: (1) digestive tract; ? Digestive gland;

(2)[4] liver; ? Fat;

(3) Small intestine