Subjects with a serious illness may be at risk for exploitation since they may be desperate for a possible cure. this is an example of

Medical Vulnerability

Explanation:

A medical vulnerability is a situation in which the patient is unable to protect himself and herself from diseases and their associated symptoms. In such a situation the patient is unable to care himself or herself against exploitation or harm caused by the disease-causing pathogen. The patient becomes desperate to get a possible cure or treatment to resume the normal healthy lifestyle.

relationship between pressure and air volume and led to the understanding of how respiration works; i believe this is the correct answer ; /// good luck