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Is the above control an example of positive or negative feedback?

Is the above control an example of positive or negative feedback?

A patient is seen in a community clinic and is diagnosed with hyperthyroidism (Graves disease). The physician orders a thyroid panel and the following results are returned to the clinic. TSH low, T3 high, T4 high. The patient complains of heat intolerance, diarrhea, anxiety, and difficulty sleeping.

1. If you consider how the hypothalamic pituitary regulation of endocrine function, can you explain why in this patient although the thyroid gland is producing too much hormone the TSH level is low?

2. Is the above control an example of positive or negative feedback?