What Makes Up the Human Vascular System?

Blood vessels are a series of pipes through which blood flows. Except for the cornea , hair, fingernails, dentin and epithelium, blood vessels are spread all over the body. Blood vessels are divided into arterial vessels, venous vessels and capillaries according to their structural functions.

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Blood vessels are a series of pipes through which blood flows. except
Arterial origin
Vein is
Capillary is the thinnest in diameter, with an average of about 6-9
Blood vessels are the channels through which blood flows, divided into arteries, veins, and capillaries. The arteries originate from the heart, branching continuously, the caliber becomes thinner, the tube
Except for the arteries-capillaries-veins, the blood vessels of the human body communicate between arteries and arteries, between veins and veins, and even between arteries and veins.
Explanation of "angiogenesis" in academic literature:
1. Angiogenesis refers to the proliferation and migration of endothelial cells, and new blood vessels are generated by budding or nesting from the existing blood vessels, which are regulated by a series of stimulating and inhibitory factors.
Blood vessel
2. Angiogenesis refers to the generation of new microvessels from the existing vascular network, which is critical for tissue regeneration, development and repair. Physiological angiogenesis is a very regular network of capillaries breeding from originally stationary endothelial cells. Tumor angiogenesis is essential for the growth of solid tumors with a diameter of several millimeters.

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