How do hormones regulate homeostasis?

• A. They regulate only short-term processes and do not affect distant organs.
• B. They act by changing soil pH.
• C. They circulate and bind receptors to coordinate activity of distant organs, maintaining balance.
• D. They are produced by the brain.

Answer: (C)

Hormones regulate homeostasis by acting as chemical messengers that travel through the bloodstream to reach target cells in distant organs. When a hormone binds to a specific receptor, it triggers a signaling cascade that adjusts the activity of those cells and often coordinates responses across multiple organs. This circulating, receptor-driven communication helps maintain stable conditions such as metabolism, temperature, fluid balance, and energy use, even as conditions change.

That’s why the option describing hormones circulating and binding receptors to coordinate distant organs to maintain balance is the best fit. It captures the systemic nature of hormonal signals and how they align the activities of different tissues to keep the body in balance. Other choices miss the essence: hormones can produce longer-range effects and distant organ targets, the idea of changing soil pH isn’t how human hormonal signaling works, and hormones aren’t produced exclusively by the brain (they originate from various glands throughout the body).