Chemical digestion in the small intestine involves secretions from the spleen that contain all enzymes necessary for complete digestion bile salts that emulsify carbohydrates so that they can be easily digested by enzymatic action a significant amount of enzyme secretion by the intestinal mucosa cholecystokinin (cck), an intestinal hormone responsible for gallbladder contraction

cholecystokinin (CCK), an intestinal hormone responsible for gallbladder contraction

Explanation:

The small intestine is part of gastrointestinal tract which follows stomach, which is in turn followed by large intestine. It is the site of digestion and absorption of the nutrients.

secretions from the spleen that contain all enzymes necessary for complete digestion-This is wrong because spleen basically acts as a filter for blood. (WRONG)

bile salts that help emulsify carbohydrates so that they can be easily digested by enzymatic action- Bile salts emulsify fats.(WRONG)

a significant amount of enzyme secretion by the intestinal mucosa-These secreations helps in lubricating and absorbing and there is no enzyme secretions, it is only water. (WRONG)

cholecystokinin (CCK), an intestinal hormone responsible for gallbladder contraction- Cholecystokinin, a peptide hormone which is responsible for the stimulation of digestion of the fats and the proteins. It is secreted by the enteroendocrine cells in duodenum. Its function induces the contraction of gallbladder . It reduces gastric acid secretion and increases the bile acid production in liver, etc. (TRUE)

your picture is not part of the scientific method.