Final answer:
In a negative feedback loop, the effector organ causes changes that counteract the initial change, aiming to restore homeostasis.
Step-by-step explanation:
In a negative feedback loop, the effector organ produces changes that are opposite in direction to the initial stimulus. This means that if a level in the body is too high, the effector organ acts to bring it down, and if a level is too low, the effector organ acts to raise it. This is fundamentally how homeostasis is maintained in living organisms. For instance, the maintenance of blood glucose levels is a classic example; when blood glucose levels rise after eating, insulin is released to lower them. Conversely, when glucose levels drop, glucagon is released to increase them. Therefore, the effector organ counteracts the initial change, seeking to restore balance.