Which concept best describes why animals are used as surrogates in biomedical studies?

• A. They are identical to humans genetically
• B. They provide a model for human biology and disease
• C. They can be mass-produced cheaply
• D. They are not subject to regulation

Answer: (B)

Using animals as surrogates in biomedical studies is grounded in the idea that they can faithfully model human biology and disease. Many animals share essential physiological processes, organ systems, and genetic pathways with humans, so studying disease progression, treatment effects, and safety in these organisms helps us understand what might happen in people. This whole-organism context lets researchers observe interactions and responses that cell cultures or computer models can’t fully capture, while still allowing controlled, well-regulated experiments. Of course, animals aren’t exact replicas of humans, so findings are interpreted with awareness of species differences and validated across multiple models. The main purpose isn’t simply cost or convenience or lack of regulation; it’s the provision of a biologically informative model that can inform human biology and disease.