Why are animals useful in biomedical research?

• A. They are similar to humans in their reactions and responses because they have similar biological structures.
• B. They are cheaper than cell cultures.
• C. They do not require ethical review.
• D. They respond identically to humans.

Answer: (A)

Animals are useful in biomedical research because many fundamental biological processes are conserved across mammals, so a whole living organism provides a realistic context for how systems interact. This means researchers can study how a treatment behaves in the body as a whole—how it is absorbed, distributed, metabolized, and excreted, and how it affects organs, the immune system, and behavior—things that can’t be captured in isolated cells or test tubes alone. While there are species differences, the similarities in physiology and disease mechanisms allow scientists to infer how findings might translate to humans and to design safer, more effective interventions.

Ethical oversight governs animal research, ensuring humane treatment and that studies are well justified and designed to minimize suffering. This is not something that would be ignored; it is a fundamental part of conducting responsible research.

Choosing animals isn’t about them being cheaper or about identical human responses. They aren’t identical to humans, but they offer a closer approximation of complex living processes than cell cultures alone, and they enable investigation of integrated biology that informs human health.