Control and Coordination Notes
All living organisms must control and coordinate the activities taking place inside their bodies. Coordination means making different cells, tissues, organs and organ systems work together properly and helping the organism respond correctly to changes in its surroundings. Why do organisms need control and coordination? A unicellular organism has only one cell, so controlling its life processes is comparatively simple. A multicellular organism contains many cells. These cells form tissues → organs → organ systems . Different organ systems perform different functions, but they must work together. For example, during running, the muscles need more oxygen. Therefore, breathing becomes faster and the heart pumps blood faster. This is an example of coordination between organ systems . Control and coordination also allow an organism to detect and respond to changes in the environment , called stimuli . Stimulus → Detection → Coordination → Response For example: Touching a hot object ...