Question

thyroid hormone effects
which is not a main effect of the t3 (triiodothyronine) hormone?
regulation of blood calcium levels
synergism with the sympathetic nervous system
promotion of growth and development
regulation of the metabolic rate and thermoregulation

Explanation:

• T3 (triiodothyronine) hormone is involved in synergism with the sympathetic nervous system (e.g., enhancing the effects of norepinephrine), promotion of growth and development (especially in the nervous system and bones in children), and regulation of the metabolic rate and thermoregulation (increases the basal metabolic rate).
• Regulation of blood calcium levels is mainly the function of parathyroid hormone (increases blood calcium) and calcitonin (decreases blood calcium in some species, its role in humans is less clear compared to parathyroid hormone's role).

Answer:

Regulation of blood calcium levels