Consider statements about human physiology: 1. The stomach secretes hydrochloric acid. 2. The small intestine is the primary site of absorption. 3. The large intestine absorbs most nutrients. Which are correct? MCQ with Answer and Explanation

The stomach's gastric glands secrete hydrochloric acid (HCl), which creates an acidic medium necessary for the activation of pepsin and kills ingested microbes. The small intestine, with its vast surface area provided by villi and microvilli, is the primary site for the digestion and absorption of most nutrients into the bloodstream. The large intestine primarily absorbs water, electrolytes, and some vitamins produced by gut bacteria, but not the majority of nutrients. Thus, statements 1 and 2 are correct.