<span>Controlling is the managerial function that involves comparing actual results with objectives to enable mid-course corrections and provide a measure of success or failure.
</span><span>This function verifies whether everything occurs in confirmities with the instructions, adopted plans and principles.</span>
The Respiratory System brings oxygen into the blood; it is the responsibility of the Circulatory System to transport it, with nutrients from digestion, to cells of the body.
The Circulatory System is three-fold: the blood carrying the substances, the vessels in which blood flows, and the heart which pumps it around in a circle-like movement and back (hence the term 'circulatory').
