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Which of the following statements accurately describes the process of digestion and absorption in the gastrointestinal tract?
1. Saliva secretion is stimulated by neural signals triggered by the presence of food in the oral cavity.
2. Active transport is a mechanism involved in the absorption of certain nutrients in the small intestine.
3. Assimilation is the process by which absorbed substances reach the tissues for utilization.
4. Egestion of feces through the anal opening is a voluntary process initiated by a neural reflex.
5. Maximum reabsorption of nutrients occurs in the small intestine.
Select the option that contains all correct statements:
1,2,3,4
1,2,3,5
1,2,4,5
2,3,4,5
Answers (1)
Statement 1 is correct because Saliva secretion is indeed stimulated by neural signals triggered by the presence of food in the oral cavity.
Statement 2 is correct because Active transport is one of the mechanisms involved in the absorption of certain nutrients in the small intestine.
Statement 4 is correct because the Egestion of feces through the anal opening is a voluntary process initiated by a neural reflex.
Statement 5 is correct because the small intestine is the primary site for maximum nutrient absorption due to its extensive surface area and specialized cells called enterocytes.
Hence, the correct answer is option 3.
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