When the calcium level in the blood is too high, the cells of the parathyroids make less parathyroid hormone (or stop making it altogether), thereby allowing calcium levels to decrease. This feed-back mechanism runs constantly, thereby maintaining calcium (and parathyroid hormone) in a very narrow normal range.
Best Answer: The learning outcome is the thing that the children produce in the lesson, while the learning objective is what you want the children to learn. For example, the learning objective might be: To be able to write descriptively, while the learning outcome could be a story or diary entry etc.
1 An instructional objective is the focal point of a lesson plan. Objectives are the foundation upon which you can build lessons and assessments and instruction that you can prove meet your overall course or lesson goals.  Think of objectives as tools you use to make sure you reach your goals.