👉 A canal is a type of duct in the human body that carries blood and other bodily fluids from one part of the body to another. The main artery, which carries oxygenated blood from the heart to the rest of the body, is called the aorta. Canals are typically divided into two main types: primary canals and secondary canals. Primary canals carry blood from the lower extremities (such as the feet) to the upper extremities (such as the arms and hands).