Question: In the process of defecation is TRUE: 
 Options:  <1> When the feces penetrate the rectal ampulla, relaxation of the internal anal sphincter occurs consciously. <2> When the feces penetrate the rectal ampulla, the external anal sphincter relaxes unconsciously. <3> The external anal sphincter is controlled by nerve fibers of the pudendal nerve, part of the somatic nervous system, and therefore under voluntary conscious control. <4> The propulsive movements of the colon under normal conditions require one hour to move the chyme through the entire colon from the ileocal valve. <5> During defecation the contraction of the floor of the pelvis occurs.
3