During compensated shock, which of the following accurately describes the capillary sphincter muscles of nonessential tissues? The pre- and post-capillary sphincter muscles are open. The pre- and post-capillary sphincter muscles are closed. The pre-capillary sphincters are open and the post-capillary sphincters are closed. The post-capillary sphincters are open and the pre-capillary sphincters are closed.