Veins tend to have the following except: a) valves for unidirectional flow b) very elastic walls c) thin walls d) increasing size toward the heart
option B. Veins are thin-walled and are much less elastic. This function allows the veins to keep a completely excessive percent of the blood in circulation. The venous device can accommodate a big quantity of blood at extraordinarily low pressures, a function termed excessive capacitance.t
