Pathophysiology is the

1. study of physiology of pathogen
2. study of normal physiology of host
3. study of altered physiology of host
4. None of the above

(3) Pathophysiology is the study of functional changes in the body of the host that occur in response to any disease or injury.

e.g., if sorneone ingests a toxin, it may result into a variety of physical changes, such as inflammation in the stomach lining.