Ileum- the Ileum is the small intestine’s last section. It attaches to the cecum (the first part of the large intestine). The ileum aids in the digestion of food that has passed through the stomach and other portions of the small intestine.

Gallbladder- the gallbladder is a small, pear-shaped organ located beneath your liver on the right side of your abdomen. Bile is a digestive fluid that is stored in the gallbladder and discharged into the small intestine.

Rectum- the rectum is the section of the large intestine that links to the sigmoid colon at its lower end. It measures approximately 15 cm (6 in) in length. It collects waste from the colon and stores it until it is expelled through the anus.

References:

RUIZ.ATENODORO. (n.d.). Rectum and Anus – Digestive Disorders – MSD Manual Consumer Version. MSD Manual Consumer Version; http://www.msdmanuals.com.
Gallstones – Symptoms and causes. (2021, August 20). Mayo Clinic; http://www.mayoclinic.org. https://www.mayoclinic.org/diseases-conditions/gallstones/symptoms-causes/syc-20354214#:~:text=Your%20gallbladder%20is%20a%20small,released%20into%20your%20small%20intestine.
NCI Dictionary of Cancer Terms. (n.d.). National Cancer Institute; http://www.cancer.gov. Retrieved April 17, 2022, from https://www.cancer.gov/publications/dictionaries/cancer-terms/def/ileum