The glands that secrete hormones comprise the endocrine signaling system. The glands that secrete hormones comprise the endocrine system. Like eccrine glands, they continuously secrete a thin, watery sweat. They are clothed in hair and their skin contains glands which secrete sweat. Only cardiac glands are found here and they primarily secrete mucus. Neutrophils can secrete products that stimulate monocytes and macrophages. This is a system of glands which secrete hormones. Typically, glands secrete tears for lubrication of the cornea. The kidneys secrete ammonia to neutralize excess acid. Snails secrete mucus externally to keep their soft bodies from drying out. However, before that disappearance, some glands secrete unequally much. The enteroendocrine cells also secrete glucose dependent insulinotropic peptide. In addition, activated macrophages secrete many inflammatory mediators. They can also secrete hormones which change the menstrual cycle. Macrophages secrete more IL-8, propagating the neutrophil-mediated inflammatory response.