Thyroid hormones exert their effects on cells in a manner similar to steroid hormones; describe the mechanism of action of thyroid hormones (hint: they are an amine hormone).

Answer & explanation:

Thyroid hormones are essential for regulating metabolism, they are T3 (triiodothyronine) and T4 (thyroxine).

The mechanism of action of the thyroid begins in the hypothalamus, an area of the brain that controls the thyroid (and other glands). The hypothalamus produces TSH (thyroid stimulating hormone), this hormone signals the thyroid to produce T3 and T4.

Then, iodine from food is taken up by the thyroid cells, oxidized and associated with thyroglobulin (protein produced in the thyroid itself), and this association finally results in the production of T3 and T4, which will be directed to various organs through of the bloodstream.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.