Which term refers to experimentation done in living tissue in an artificial environment outside the organism?

• A. Ex Vivo
• B. In Vitro
• C. In Vivo
• D. Mechanical Index

Answer: (A)

Experimentation done in living tissue in an artificial environment outside the organism is ex vivo. This means tissue or organs are removed from the body but kept viable and studied in a controlled lab setup that mimics physiological conditions. It preserves much of the tissue’s architecture and function while being outside the living organism.

In contrast, in vitro usually refers to studies conducted with isolated cells or molecules in a non-biological environment like a petri dish or test tube, often lacking the intact tissue structure. In vivo means testing inside a living organism. The Mechanical Index is an ultrasound parameter, not a type of experimental setting.