1.

The diagram shows the interaction between the hypothalamus, pituitary and thyroid glands. Arrow indicates the probable pathway of direct influence. Answer the following questions.1. Name the hormones A and B. 2. State the effect of hormone A on the thyroid. 3. State the effect of hormone B on the hypothalamus. 4. Describe the control on pituitary by the hypothalamus in this situation.

Answer»

1. A-Thyroid stimulating hormone B-Thyroxine

2. Thyroid stimulating hormone stimulates the thyroid follicle to synthesis two hormones, thyroxine and triiodothyronine. 

3. The high level of thyroxin inhibits the production of thyrotropin releasing hormone. 

4. Thyrotropin releasing hormone of the hypothalamus stimulates the pituitary to release thyrotropin stimulating hormone (TSH) which in turn stimulate thyroid gland to produce thyroxine



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