The pulmonary veins are the only veins in the body that carry oxygenated blood. Like all veins the blood in the pulmonary veins travel toward the heart.
Spider veins look bluish, red, or purple and spread out like a spider web. You can see the markings on the surface of the skin. More information can be found here: http://www.livestrong.com/article/237182-characteristics-of-broken-capillaries/
They have one cotyledon in the seed, petals usually in multiples of 3, and veins branching up and down the leaf.
Supplier of Human Blood Products and Components
veins are unique because they connect to the capillaries and return oxygen- rich blood to the right atria of the heart so that blood can exchange carbon dioxide for fresh oxygen in the lungs
A dicotyledon has leaves with a network of veins, and also, the seed contains an embryo that contains two seed leaves
There are four major characteristics: -flower parts in threes -one cotyledon (embryonic leaf) -parallel leaf veins -scattered vascular bundles
There are three major categories of veins: superficial veins, deep veins, and perforating veins. All varicose veins are superficial veins; they lie between the skin and a layer of fibrous connective tissue called fascia.
There are four major characteristics: -flower parts in threes -one cotyledon (embryonic leaf) -parallel leaf veins -scattered vascular bundles
There are three types of veins, superficial veins that are just beneath the surface of the skin, deep veins that are large blood vessels found deep inside muscles, and perforator veins that connect the superficial veins to the deep veins.
Pulmonary veins
Visible blue veins can be a normal trait in some individuals, especially those with fair or light skin tones. This is because the veins sit close to the surface of the skin. However, if you are concerned about your health or these characteristics have recently changed, it's best to consult a healthcare professional for a proper assessment.