2007-03-21 03:14:23 · 4 answers · asked by anthony s 1 in Science & Mathematics ➔ Medicine
Hormones are basically small molecules that relay a message to another cell or tissue -- in that way, they are messengers. The way in which they communicate that message makes them special because they can either trigger a receptor on the cell surface to stimulate a reaction within the target cell, or they can enter the cell directly to mediate some reaction in the cytoplasm or nucleus of the target cell, thereby altering its activity.
2007-03-21 05:54:38 · answer #1 · answered by citizen insane 5 · 0⤊ 0⤋
Pheromones.
A pheromone is any chemical or set of chemicals produced by a living organism that transmits a message to other members of the same species.
I'm not sure if they are really hormones because I don't think they go into the blood stream, but into the sweat glands.
2007-03-21 10:24:41 · answer #2 · answered by Dr Dave P 7 · 0⤊ 0⤋
Because that's what they do. Hormones are secreted by specific tissues into the bloodstream, then travel to their target tissues and tell them to do something. For example, insulin is secreted into the bloodstream from the pancreatic islet cells and tells various types of tissue (for example, muscle, liver) to take in glucose from the blood.
2007-03-21 11:13:33 · answer #3 · answered by grimmyTea 6 · 0⤊ 0⤋
its all about cytoplasm entering cells of activity.it tells other cells what to do. it sends signals to certain pts of the body.for activation.
2007-03-25 02:43:12 · answer #4 · answered by Anonymous · 0⤊ 0⤋