Final answer:
A lesion consisting of channels with flowing blood is usually a severed blood vessel. Such injuries can lead to conditions like hemorrhagic strokes or vasculitis, causing visible signs or internal damage. The central canal in bones and the circulatory system's network of arteries and veins also illustrate channels through which blood flows.
Step-by-step explanation:
The lesion made of channels containing flowing blood is typically a blood vessel that has experienced an injury, such as being severed. When a blood vessel is cut or damaged, blood and its components, like erythrocytes (red blood cells) and leukocytes (white blood cells), can leak out of the vessel. This type of lesion can occur in various parts of the body including the cerebrum, as in the case of a hemorrhagic stroke, where a hemorrhage can result in a significant accumulation of blood and subsequent swelling in adjacent tissues. Additionally, conditions such as vasculitis can cause blood to leak from damaged vessels, leading to visible symptoms like purple spots on the skin.
Blood vessels, such as arteries and veins, have a network much like a river with many tributaries and channels. In the skeletal system, the central canal, also known as the Haversian canal, is a longitudinal channel in the center of each osteon that contains blood vessels, nerves, and lymphatic vessels. Furthermore, an understanding of blood flow through the circulatory system indicates that blood moves from the heart through arteries to capillaries, then into veins, and eventually returns to the heart.