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Thryoxine is a hormone derived from the amino acid 'Tyrosine' and so is classed as an amino-acid derivative.

(NB: Amino-acids are the basic structural units of a peptide/protein).

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14y ago

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What is the hormone responsible for metamorphosis in frogs and toads?

The hormone responsible for metamorphosis in frogs and toads is thyroxine. Thyroxine is produced by the thyroid gland and plays a crucial role in regulating the transformation of tadpoles into adult frogs or toads during metamorphosis.


If tadpoles are placed in iodine deficient water what will happen to them and why?

In case of frogs or tadpoles the growth or metamorphosis is controlled by thyroxine hormone. Presence of iodine is must for th production of thyroxine hormone.


Can you Asses the reason hormone feedback systems are referred to as negative feedback?

When a drop in the level of hormones in the body occurs, it causes a chain reaction of responses. It is called negativefeedback because it causes system output to oppose system input, rather than support it.Example: Thyroxine (a thyroid hormone) level in the blood drops. The hypothalamus then sends out an order for TSH (thyroid stimulating hormone) to the anterior pituitary gland. The pituitary releases the TSH. TSH then causes the thyroid to start producing thyroxine again. When the blood level rises, the hypothalamus stops producing TSH, causing the thyroid to stop producing thyroxine. This happens in a loop until stabilization occurs.


What is t3 made from?

T3, or triiodothyronine, is a thyroid hormone that is produced by the thyroid gland from the conversion of T4 (thyroxine) with the help of enzymes. It plays a role in regulating metabolism and other bodily functions.


If an animal has been thyroidectomized what hormone is would be missing from its blood?

If an animal has been thyroidectomized, it would be missing thyroid hormones such as thyroxine (T4) and triiodothyronine (T3) from its blood. These hormones play important roles in regulating metabolism, growth, and development in animals.