🔬Gall bladder human c.s. (Scanner)
The gallbladder, located just below the liver, is a thin-walled, pear-shaped organ measuring approximately 7 to 10 centimeters (2.7 to 3.9 inches) in length and up to 5 centimeters (2 inches) in width at its widest point. Its primary function is to store and concentrate bile produced by the liver.

🔬Ileum, human (Scanner)
The ileum, the last part of the small intestine, connects to the cecum, which is the beginning of the large intestine. It aids in further digesting food that has come from the stomach and other parts of the small intestine.

🔬Jejunum mammal c.s. (Scanner)
The jejunum, the middle part of the small intestine, is located between the duodenum and ileum. It receives arterial blood from the jejunal arteries and is innervated by the celiac and superior mesenteric plexuses, along with the vagus nerve. Accounting for 40% of the small intestine, the jejunum is essential for digestion, absorbing water and nutrients.

🔬Human stomach, cardiac c.s. (Scanner)
The stomach, a J-shaped organ, is a component of the gastrointestinal (GI) tract responsible for digesting food. It produces enzymes and acids, which together form digestive juices that break down food, allowing it to move into the small intestine.

🔬Human Duodenum c.s. (Scanner)
The first part of the small intestine is the duodenum which is located between the stomach and the jejunum. It passes into the duodenum once food combines with stomach acid. This is where it mixes with bile from the gallbladder and digestive enzymes from the pancreas.

Reference/s:
Cleveland Clinic. (2021, September 9). Stomach. https://my.clevelandclinic.org/health/body/21758-stomach.
Institute for Quality and Efficiency in Health Care (IQWiG). (2021, April 27). In brief: How does the gallbladder work?InformedHealth.org – NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK279386/#:~:text=The%20gallbladder%20is%20located%20right,concentrates%20bile%20from%20the%20liver.
Kenhub. (2023, October 30). Jejunum. https://www.kenhub.com/en/library/anatomy/the-jejunum.
MedlinePlus Medical Encyclopedia. (2022, October 20). Duodenum. https://medlineplus.gov/ency/article/002347.htm#:~:text=The%20duodenum%20is%20the%20first,digestive%20juices%20from%20the%20pancreas.
NIH. (n.d.). Ileum. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/ileum.