Nipple: The nipple is often a lifted structure located in the center of the breast. It incorporates little muscles that agreement in response to stimulation. When the breasts are stimulated by the suckling of her baby, the mom's Mind secretes oxytocin. Superior levels of oxytocin induce the contraction of muscle https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb