The homeostatic regulation of an animal involves three basic steps, viz. detection of changes in the environment, evaluation of changes and adjustment or response to the changes respectively. Which of the following are the components that are sequentially involved in such a regulation?

When the stimulus exceeds a threshold value,  the receptors release an impulse to the neuron connected to it and that sensory neuron transmits the impulse to the central nervous system, i.e. brain or spinal cord. They evaluate and analyze the impulse and send it to specific effectors in muscle, which ultimately respond to the stimulus by contracting specific organ or organs.