Answer
27. Peristalsis is a series of muscular contractions that move food through the digestive tract by squeezing and relaxing the muscles in a coordinated manner.
28. Hydrochloric acid and pepsin work on breaking down proteins in food, while bile works on breaking down fats.
29. The small intestine is responsible for absorbing nutrients from food, while the large intestine absorbs water and electrolytes and eliminates waste.
30. Drinking plenty of water helps to prevent dehydration and can help to soften stool, making it easier to pass during constipation. In diarrhea, water helps to replace fluids lost through frequent bowel movements.