Answer:
The correct option is a. The only endocrine gland that stores its hormone product extracellularly is the thyroid.
Step-by-step explanation:
The thyroid gland is in the neck and is extremely fragile. The thyroid's function is to secrete thyroid hormones, these hormones have two functions: they regulate the growth and differentiation of cells and control the basal metabolic rate (rate at which the body's chemical reactions take place, temperature regulation)
The synthesis of thyroid hormones, is produced from 2 elements one contributed by the thyroid gland thyroglobulin and the other is a mineral that comes from the diet and is iodine. Both monoiodothyrosine and diiodotyrosinase concentrate in extracellular fluid and systemic circulation.
The most important thyroid hormone is thyroxine. It is synthesized in the thyroid gland from iodine, from the diet, and from the amino acid tyrosine. Its secretion is controlled by the pituitary gland through the negative feedback mechanism.