Question

Which of the following hormones is more active than T4?
(a) T1
(b) T2
(c) T3
(d) T5

Answer 1

This hormone is derived by the deiodination of the T4 hormone. Also known as triiodothyronine. Plays an important role in controlling the body’s metabolism and temperature.

Complete step by step answer:
The significantly more active hormone T3 is a derivative of T4 which is the majorly secreted thyroid hormone. The conversion of T4 to T3 takes place inside the peripheral tissues (liver and kidney to be more precise).
Often known as T3, triiodothyronine is a thyroid hormone. It affects nearly every physiological process in the body, including development and growth, metabolism, the temperature of the body, and heart rate.
So, the correct answer is the ‘T3 hormone’.

Additional information:
Let’s learn a little bit more about the thyroid hormone in general.
The thyroid gland is a crucial hormonal gland: it plays a major role in the human body's metabolism, growth, and development. By continuously releasing a steady amount of thyroid hormones into the bloodstream, it helps to control many body functions.
Thyroid hormones, namely triiodothyronine (T3) and thyroxine (T4), are two hormones that are formed and released by the thyroid gland. They are hormones dependent on tyrosine that are mainly responsible for metabolic control.
T3 and T4 consist partly of iodine. Iodine deficiency leads to reduced T3 and T4 development, enlarges the thyroid tissue, and causes the disease known as simple goiter.
Thyroxine (T4), which has a longer half-life than T3, is the dominant form of thyroid hormone in the blood. The ratio of T4 to T3 released into the blood in humans is approximately 14:1.

Note: It may cause imbalances that are associated with a host of symptoms when your thyroid releases too many or too few hormones. Hypothyroidism is the term for an underactive thyroid, one that produces too few hormones, and an overactive thyroid, one that produces too many hormones, is defined as hyperthyroidism.