Sources of hormones in humans = the endocrine system [Fig. 37.2] 3. Target cells = cells with receptors for a given chemical messenger that can alter their activities in response to messenger.- Hormones are transported throughout the body by the blood, but they only elicit responses in target cells.. Do not diffuse into cells. b. Target cells have specific receptor for hormone on cell surface. c. Hormone binds to receptor and causes a second messenger to be released within the cell.
Definition of herder. : one that herds; specifically : a person who manages, breeds, or tends to livestock : herdsman 1.
The basic precept of any herding mentality, be it amongst people or animals, is the instinct to move and think as a group. There is safety in groups, as well as anonymity. A sense of shared responsibility usually abounds, as well. In the wild, the instinct to stick with a herd is mostly one of physical survival.