Final answer:
The low pH of gastric juices in the stomach is ideal for digestion because it enhances enzyme activity, facilitates protein denaturation, kills bacteria, and activates pepsinogen. All of the above options (a, b, c, d) are correct.
Step-by-step explanation:
The low pH of gastric juices in the stomach is ideal for digestion because it enhances enzyme activity, facilitates protein denaturation, kills bacteria, and activates pepsinogen.
- Enhances enzyme activity: Digestive enzymes, such as pepsin, work best in an acidic environment. The low pH helps to optimize their activity in breaking down proteins into smaller molecules.
- Facilitates protein denaturation: The low pH of gastric juices helps to unfold the protein molecules, exposing their chains to more efficient enzyme action.
- Kills bacteria: The high acidity of the stomach helps to kill off many bacteria present in the food, protecting the body from potential infections.
- Activates pepsinogen: The low pH triggers the conversion of inactive pepsinogen into its active form, pepsin, which is the main digestive enzyme in the stomach.
In conclusion, all of the above options (a, b, c, d) are correct. The low pH of gastric juices in the stomach is crucial for effective digestion.