Endocrine signaling occurs through molecules secreted into the bloodstream. Most ingested lead is absorbed into the bloodstream. Less often infection occurs through the bloodstream. All catheters can introduce bacteria into the bloodstream. The bacteria can kill up to half of patients who get bloodstream infections. The bacterium then produces the toxin, which is absorbed into the bloodstream. The virus is subsequently absorbed into the bloodstream. This metabolite then circulates in the bloodstream. They can drink salt water because their supraorbital gland filters excess salt from the bloodstream. It may be brought in by the bloodstream or the lymphatic system. Breast milk is made from nutrients in the mother's bloodstream and bodily stores. Approximately of amphetamine circulating in the bloodstream is bound to plasma proteins. The administration of substances into the bloodstream. It is a type of bloodstream infection. This can diminish levels of platelets available in the bloodstream, leading to thrombocytopenia.