 Okay, so one of the characteristics of life is responsiveness. Responsiveness means that you can detect changes in the environment, whether those are internal or external changes, and then respond to them appropriately so that you can maintain homeostasis. There is a simple dance that you can do to remember all of the parts that are involved in responsiveness. And then once you know this dance, every system of your body is involved with responsiveness, which means once you learn it, you will see the same dance over and over again from now until the end of your anatomy career. Okay, so the start of the dance is going to be with the activation of your receptors. The receptors are going to grab a particular stimulus and then turn that stimulus into an action potential which travels up your afferent pathway. That afferent pathway goes into your control center where it's dropped off and turned into motor information. The motor information travels down your afferent pathway to your effectors. The effectors carry out your effect and send the message out. So now you've responded to something like a change in temperature and figured out how to maintain homeostasis. Now we're going to do it all together. You ready? Start off with the receptors. Receptors are activated. They grab the stimulus, send the information of the afferent pathway to your control center where they drop it off. There you turn the sensory information into motor information, which goes out your efferent pathway to your effectors, which send it away.