Assertion:Coordination is the process through which two or more organs interact and complement the functions of one another.

Reason:The increased supply of oxygen necessitates a decrease in the rate of respiration, heart beat and increased blood flow via blood vessels.

The assertion is correct but the reason is incorrect.

The correct answer is Option (3)- The assertion is correct but the reason is incorrect.

The functions of the organs/organ systems in our body must be coordinated to maintain homeostasis. Coordination is the process through which two or more organs interact and complement the functions of one another. For example, when we do physical exercises, the energy demand is increased for maintaining an increased muscular activity. The supply of oxygen is also increased. The increased supply of oxygen necessitates an increase in the rate of respiration, heart beat and increased blood flow via blood vessels. When physical exercise is stopped, the activities of nerves, lungs, heart and kidney gradually return to their normal conditions. Thus, the functions of muscles, lungs, heart, blood vessels, kidney and other organs are coordinated while performing physical exercises. In our body the neural system and the endocrine system jointly coordinate and integrate all the activities of the organs so that they function in a synchronised fashion.