_________________________ occurs when a target cell has been exposed to a hormone for an extended period of time and decreases the number of receptors for that hormone.

_________________________ is the term that describes two hormones that work together to stimulate a target cell with similar effects.

_________________________ occurs when two hormones work in opposition on target tissue.

_________________________ happens when one hormone must be present in order for another hormone to carry out its effects on target tissue.

_________________________ is the loop that occurs when release of a hormone is inhibited.