2007-03-18 20:23:59 · 5 answers · asked by patricia m 1 in Health ➔ Diseases & Conditions ➔ Heart Diseases
Anatomically they are similar, one of the hearts valves has two leaves, the other has three, veinus valves have two. Functionally they are also similar, they both open due to muscular contraction forcing blood through them. In the case of veins blood is moved by skeletal muscle contraction, whereas smooth muscle contraction is responsible for the movement of blood through the heart. Normally (in both cases) backpressure closes the valve and prevents backflow.
2007-03-18 20:39:29 · answer #1 · answered by Mad Scientist 2 · 0⤊ 0⤋
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2016-05-18 18:43:28 · answer #2 · answered by Gabrielle 3 · 0⤊ 0⤋
Vessel that carries blood to the heart. Except for the pulmonary veins, veins bear deoxygenated blood from capillaries, which converge into threadlike venules and then veins, finally emptying into the venae cavae . Blood moves through veins by contraction of the surrounding muscles. Backflow is prevented by valves in most veins' inner layer (tunica intima), which lacks the elastic membrane lining of arteries. The thin middle layer (tunica media) is mostly collagen fibres, and the thick outer layer (tunica adventitia) is mostly connective tissue.
2007-03-19 10:56:20 · answer #3 · answered by Dr.Qutub 7 · 0⤊ 0⤋
Only that they control direction of blood flow.
2007-03-19 02:16:12 · answer #4 · answered by xxx 4 · 0⤊ 0⤋
the similarity is function which is to keep flow in one direction
2007-03-18 20:33:32 · answer #5 · answered by tolitstolites 3 · 0⤊ 0⤋