<u>Answer:</u>
Receptors
<u>Explanation: </u>
Receptors are specific for the particular parameter . They work to detect change and convert the change into signals that serves as a afferent input to the control center.
Negative feedback requires a receptors,control center, and a afferent. Generally a receptor monitors internal conditions. Receptors sense changes in function and initiate the body's homeostatic response.
I believe for number 1 the answer is A 260