Which best describes how the endocrine system works?

The endocrine system of the body manufactures hormones in specific glands. Each gland then secretes specific hormones into the bloodstream where they are disseminated throughout the body. Each hormone stimulates certain cells to perform certain actions. Hormones are signaling molecules. The immune system, specifically the humoral immune response, defends the body through the use of antibodies. The muscular system produces movement by contraction upon nervous stimulation. The cardiovascular system maintains blood flow through the use of the heart muscle.