does proteins transport substances through the bloodstream
Other hormone transport proteins are relatively non-selective, transporting almost any lipophilic molecule that enters the bloodstream, including steroid and thyroid hormones, plant-derived flavonoids, retinoids (vitamin A), fatty acids, and antibiotics.hese transport proteins deliver the hormones to their target cells and protect them from being chemically altered, inactivated, and eliminated from the body by the liver and kidneys. Some hormone transport proteins in plasma are highly selective, transporting only steroid or only thyroid hormones.