Question

which statement best describes the breakdown of food in the digestive system?

• carbohydrate digestion starts in the stomach and protein digestion starts in the stomach.
• carbohydrate digestion starts in the mouth and protein digestion starts in the stomach.
• carbohydrate digestion starts in the esophagus and protein digestion starts in the small intestine.
• carbohydrate digestion starts in the small intestine and protein digestion starts in the esophagus.

Explanation:

To solve this, we recall the digestive process: Carbohydrate digestion starts in the mouth (due to salivary amylase), and protein digestion starts in the stomach (due to pepsin). Let's analyze each option:

• First option: Carbohydrate digestion does not start in the stomach (it starts in the mouth), so this is wrong.
• Second option: Matches the correct start points (carbohydrates in mouth, proteins in stomach).
• Third option: Carbohydrate digestion doesn't start in esophagus, protein digestion doesn't start in small intestine (starts in stomach), so wrong.
• Fourth option: Carbohydrate digestion doesn't start in small intestine (starts in mouth), protein digestion doesn't start in esophagus, so wrong.

Answer:

B. Carbohydrate digestion starts in the mouth and protein digestion starts in the stomach. (Note: Assuming the second option is labeled as B; if the original options had different labels, adjust accordingly based on the option order. Here, the second option is the correct one.)