Answer: A: It becomes inactive.
Explanation: Pepsin works best at a pH of 2. And as the stomach has a very acidic condition, pepsin works well. But in the small intestine, the pH is about 8, which is too high for pepsin to function. Therefore, pepsin gets denatured in the small intestine.
A) Villi are useful in providing more surface area!
Answer:
True
Explanation:
Diffusion is the movement of particles from areas of high concentration to areas of lower concentration. This is described as a movement with the concentration gradient.
