why is it important for veins to have valves
Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
Vein Veins are present throughout the body as tubes that carry blood back to the heart. Veins are classified in a number of ways, including superficial vs. deep, pulmonary vs. systemic, and large vs. small.
Pulse Pressure waves generated by the heart in systole move the arterial walls. Forward movement of blood occurs when the boundaries are pliable and compliant. These properties form enough to create a palpable pressure wave.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.