According to Health.com, humans cannot fully digest corn because it contains the fiber cellulose. The human digestive system cannot completely break down cellulose because it lacks the enzyme to do so, leading to the trouble people often have fully digesting corn.
Health.com notes that humans may have been able to digest corn fully in prehistoric times since they had sharper teeth. Today, corn can still be digested if it is chewed on long enough to break down the cellulose fibers. If not, eating corn can cause abdominal discomfort and gas, and undigested kernels may show up in stool. Chewing corn fully also allows the nutrients in it to be absorbed better.Learn More
In humans, the small intestine is about 20 feet long, and the large intestine is about 5 feet long. Both are situated in the abdomen and form a continuous tube from the stomach to the anus.Full Answer >
Some of the most vital organs of humans are located in the thoracic cavity, including the lungs and the heart. HowStuffWorks explains that when a person inhales, the diaphragm and muscles between the ribs expand the thoracic cavity to reduce the pressure inside the body to a level that is lower than the pressure of the air outside the body. As a result, the lungs pull air through the body's airways.Full Answer >
The colon, or large intestine, is about 5 feet long in humans. The large intestine is the last segment of the digestive system, which is 30 feet in total length.Full Answer >
The spleen serves two major functions in humans. First, it plays an important role in adaptive immunity; groups of B and T lymphocytes reside in the spleen. These white blood cells produce antibodies, fight bacteria and viruses and destroy infected cells. Second, the spleen holds a third of the body's platelets in reserve. If a person suffers an internal hemorrhage, the spleen releases these platelets into the circulation.Full Answer >