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 shepherd /ËÊÉpÉrd/ or sheepherder is a person who tends, herds, feeds, or guards herds of sheep. The word stems from an amalgam of sheep herder.he Shepherd by Frederick Forsyth is the story of a flight from Germany to England undertaken by a young Vampire pilot one Christmas Eve. Biographies of David Ben-Gurion published in the early years of Israel emphasized his having been a shepherd immediately after his arrival in the country in the 1900s.