Introduction: The author tells us it is your ______ that enable you to hear sound around you. How do your ears function: The ear can be divided into three parts--the outer ear, the middle ear and the inner ear. The function of the outer ear is to ___________________. The middle ear lies on the inner side of the ear-drum. The sounds cause the ear-drum to _______________ , which in turn causes the _______ in the cochlea contained in the inner ear to move. When this happens, sound messages are sent to the brain by the nerves. Conclusion: So you must ____________ your ears.