Question

The thyroid hormone controls the body's metabolism. The two main hormones thyroid releases are thyroxine (T4) and triiodothyronine (T3), which collectively comprise the thyroid hormone. The thyroid-stimulating hormone (TSH) in the pituitary gland stimulates the thyroid to release the hormones. Ram lives in a remote part of a Himalayan village. He visited the doctor with symptoms of tightness in the throat and a hoarse voice. Given below are the test results: TSH: 6 mIU/L (normal: 0.4-5 mIU/L) T3: 1.76 μg/dL (normal: 4.6-12 μg/dL) T4: 21 ng/dL (normal: 80-180 ng/dL) Blood sugar (post-meal): 180 mg/dL (normal: 170-200 mg/dL) (a) What could be the deficiency disease Ram maybe suffering from? Justify. (b) State TWO reasons why the doctor prescribed a thyroid test.

(a) Name the glands that secrete : (i) Adrenaline (ii) Thyroxin (b) Explain with example how the timing and amount of hormone released are regulated in the human body.