Thyroid hormones exhibit _______.Multiple choice question.poor water solubilitymedium water solubilityvery high water solubility

Thyroid hormones, which include thyroxine (T4) and triiodothyronine (T3), are known for their lipid-soluble properties. This characteristic influences their transport and function within the body.

Among the options provided:

1. Poor water solubility - This aligns with the chemical nature of thyroid hormones, as they are derived from the amino acid tyrosine and consist of iodine. Their structure allows them to easily cross cell membranes, which consists primarily of lipid layers, making them less soluble in water.

2. Medium water solubility - This does not adequately describe the behavior of thyroid hormones in an aqueous environment.

3. Very high water solubility - This is inconsistent with their properties, as high water solubility would indicate that they would struggle to pass through lipid membranes, which is contrary to their physiological function.

Thus, the best answer is poor water solubility. This property plays a crucial role in how these hormones are released into the bloodstream and how they act on target tissues, showcasing their involvement in metabolic processes and growth regulation in the body.