As we know, we use the bathroom when we feel an urge to have a bowel movement. When we feel that urge we make our way to the toilet where we sit and stool leaves the body out of the anus (that’s just a fancy word for your butt hole) and into the porcelain throne below. The sphincter muscle is responsible for keeping the anus closed and not letting stool through unless it relaxes and opens when you are poo-pooing.
At the end of the digestive system you’ll find the colon and at the end of that is the rectum. The colon is responsible for absorbing water and electrolytes and turning waste into a solid mass. The rectum is responsible for holding that waste until you have a bowel movement. Above the rectum and colon is the small intestine. Your small intestine (or small bowel) has a number of responsibilities, one of them being absorbing the nutrients from the food you eat.
Some people have medical conditions and need to have their colons removed and sometimes both the colon and the rectum. Because these people no longer have the organs responsible for normal bowel movements they usually require an ostomy. An ostomy is a surgical opening in the abdomen where a portion of the bowel pokes through. Because the person can’t control what is moving through their digestive system they have to wear a bag on their tummy to collect their waste.