Explain the process of digestion and absorption of nutrients

Explain the process of digestion and absorption of nutrients in the gastrointestinal tract, from ingestion to elimination. Begin by detailing mechanical digestion in the mouth through chewing and chemical digestion via enzymes like amylase, breaking down carbohydrates into simpler sugars. Then, discuss the passage of food through the esophagus into the stomach, where gastric glands secrete hydrochloric acid and pepsinogen for protein digestion. Elaborate on the role of the small intestine in nutrient absorption, facilitated by villi and microvilli, and the action of enzymes from the pancreas and bile from the liver for further digestion of macronutrients. Next, describe the absorption of nutrients into the bloodstream and lymphatic system, including the transport of glucose and amino acids. Finally, discuss the reabsorption of water and electrolytes in the large intestine and the formation and elimination of feces.