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.
A herd is a bunch of animals â or people who act like a bunch of animals. It's also a verb â when people herd animals, they try to keep them moving in the same direction. A herd usually refers to a group of animals with hooves, like cows or sheep (meat-eating animals like wolves cruise around in packs). On a farm, sheepdogs are in charge of herding the herd of sheep. Herds of buffalo roam the plains. It's rarely a good thing when people act like a herd, which is to do what everyone else is doing. You might want to break away from the herd if everyone is wearing pinwheel hats, for example.