Is it true that some endogenous compounds can act as xenobiotics?

Is it true that some endogenous compounds can act as xenobiotics?

• A. No
• B. Yes
• C. Only after modification
• D. Only in disease states

Answer: (B)

Xenobiotics are substances foreign to the body's normal chemistry that the detoxification systems work to eliminate. Endogenous compounds come from within the body, but whether something is a xenobiotic depends on the context, not on its origin alone. If a chemical is normal in one species or in a particular physiological context but is encountered by a different species or outside its usual context, the body treats it as foreign and subjects it to xenobiotic metabolism. Even an endogenous molecule can act as a xenobiotic if it is introduced from outside, present in a non-physiological amount, or encountered in a context where it is not normally part of the body's chemistry. So, it is true that some endogenous compounds can act as xenobiotics.

Xenobiotics are substances foreign to the body's normal chemistry that the detoxification systems work to eliminate. Endogenous compounds come from within the body, but whether something is a xenobiotic depends on the context, not on its origin alone. If a chemical is normal in one species or in a particular physiological context but is encountered by a different species or outside its usual context, the body treats it as foreign and subjects it to xenobiotic metabolism. Even an endogenous molecule can act as a xenobiotic if it is introduced from outside, present in a non-physiological amount, or encountered in a context where it is not normally part of the body's chemistry. So, it is true that some endogenous compounds can act as xenobiotics.