Hormones | Back to Top. The endocrine system is a collection of glands that secrete chemical messages we call hormones. These signals are passed through the blood to arrive at a target organ, which has cells possessing the appropriate receptor.he thyroid gland is located in the neck. Follicles in the thyroid secrete thyroglobulin, a storage form of thyroid hormone. Thyroid stimulating hormone (TSH) from the anterior pituitary causes conversion of thyroglobulin into thyroid hormones T4 and T3. Almost all body cells are targets of thyroid hormones.
Cocaine generally stays in your system for about 2-4 days. In fact, this is the detection window for urine for most casual users. However, chronic or heavy cocaine users may have a much longer detection window.s with other drugs, cocaine concentrations in hair are visible for at least 90 days after dosing. However, cocaine does not leave its marks at the root of the hair, but to specific areas. That means that it is there until the hair falls out or is cut off.
Blood Test for Cocaine. Cocaine in the blood is detectable from few minutes and up to 5-6 hours after a single dose (2). Blood tests for cocaine are expensive. Cocaine may appear in the hair as soon as 8 hours or sometimes only 7-10 days after a single use and can stay there for months â until the hair is cut. The amount of cocaine and time when it was used cannot be reliably determined by a hair test (4).