1) As the body's chemical messengers, _____________________ transfer information and instructions from one set of cells to anoth
er. 2) A _______________ is a group of cells that produces and secretes, or gives off, chemicals.
3) Hormones are released into the bloodstream via small tubes called_________________.
4) Hormones find their way through the blood to their ___________________ cells.
5) Each hormone is a differently shaped key that will only fit into the correct __________________ lock.
active transport uses energy from ATP which is not found in the nucleus. so we know it uses energy which is not it's own and ATP is not apart of the nucleus so that leaves c