The diagram on the right shows feedback mechanisms associated with the thyroid?

The diagram on the right shows feedback mechanisms associated with the thyroid gland. In your notebook, identify what is occurring at labels (A) through (F), and name the hormones involved at each point.

Given that (C) represents an increase in thyroxine, identify the remaining letters (A) through (F) naming the hormones at each point and whether it is increasing or decreasing. Assume the left side of the diagram represents the positive feedback and the right side represents the negative feedback of the system.

Is point (C) an example of a negative or a positive feedback mechanism?
Explain.