They have valves so that they can move lymphatic fluid much the same as veins by skeletal muscle contraction.
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the walls of lymphatic vessels are similar to those of veins
Yes, somewhat. Lymph doesn't circulate like blood but has a system parallel to the blood vessels.
yes it does
No the lymphatic system did not have any pump like blood circulation systme. The lymph is moved along the lymphatic vessel network by either intrinsic contractions of the lymphatic vessels or by extrinsic compression of the lymphatic vessels via external tissue forces.
There are four total valves in the heart. The Mitral and Tricuspid in the atria and ventricles The Aortic between the Aorta and left ventricle The Pulmonary between the Pulmonary artery and right ventricle