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.
Definition of 'herd'. herd. A herd is a large group of animals of one kind that live together. ...dairy herds. If you say that someone has joined the herd or follows the herd, you are criticizing them because you think that they behave just like everyone else and do not think for themselves. They are individuals; they will not follow the herd. If you herd people somewhere, you make them move there in a group.