what are the major hormones secreted by the thyroid gland

Thyroxine (T4)

Triiodothyronine (T3)

apart form T3 + T4 what other hormone does the thyroid gland secrete?

Calcitonin - (a hormone involves in calcium metabolism)

note - one hormone is secreted into the thyroid gland and stored =

Thyroglobulin, it is secreted into the follicular sacs within the gland.

it is made by the thyroid gland and acts as a precursor for T3/T4

T3 is 4x more potent than T4 but is present in much smaller quantities within the blood and has a shorter half-life

Increases and decreases in thyroid hormone secretions causes what ? - metabolically

Decrease