Definition: Arteriocapillar is a term in medical science referring to vessels that branch from blood vessels, typically in the skin or internal organs like veins or arteries. Definition: Arterial capillaries are small round vessels located at the surface of the skin and other body surfaces, such as the brain and heart. These vessels carry red blood cells, hormones, and nutrients throughout the body, delivering oxygen and removing carbon dioxide. Artery walls typically have a smooth, waxy outer layer called dermis. The inner lining is primarily collagen, with a few fatty and cholesterol-filled capillaries. In contrast, capillary beds are smaller blood vessels that branch out from larger vessels, often called arterioles. Capillaries in these arteries carry blood and nutrients to the body's tissues, while capillaries in veins receive oxygenated blood. Arterial capillaries can be either open or closed as per the flow rate of the blood. Closed arterials are found at the ends of blood vessels (such as veins) and do not allow blood to flow freely but allow it to pass through walls (like arteries). The term 'arteriocapillary' is derived from the Greek word 'aracteris' meaning "capillary," which, in this context, refers to the small capillary networks of blood vessels that form the inner part of a capillary bed. Arterial capillaries are important for transporting nutrients and oxygen throughout the body. They allow efficient delivery of these vital substances to cells and tissues, which is crucial for maintaining bodily health and functioning correctly.