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Vein. Structure of a vein, which consists of three main layers; an outer layer of connective tissue, a middle layer of smooth muscle, and an inner layer lined with endothelium. Veins (/ veɪn /) are blood vessels in the circulatory system of humans and most other animals that carry blood towards the heart.
Atherosclerosis, the narrowing of the blood vessels due to the buildup of plaque, and the coronary artery disease that often follows can cause heart attacks or cardiac arrest and is the leading cause of death worldwide resulting in 8.9 million deaths or 16% of all deaths. [17] [18] Blood vessel permeability is increased in inflammation.
50720. Anatomical terminology. [edit on Wikidata] An artery (from Greek ἀρτηρία (artēríā)) [1] is a blood vessel in humans and most other animals that takes oxygenated blood away from the heart in the systemic circulation to one or more parts of the body. Exceptions that carry deoxygenated blood are the pulmonary arteries in the ...
A capillary is a small blood vessel, from 5 to 10 micrometres in diameter, and is part of the microcirculation system. Capillaries are microvessels and the smallest blood vessels in the body. They are composed of only the tunica intima (the innermost layer of an artery or vein), consisting of a thin wall of simple squamous endothelial cells. [2]
The endothelium is a thin layer of single flat cells that line the interior surface of blood vessels and lymphatic vessels. [1] Endothelium is of mesodermal origin. Both blood and lymphatic capillaries are composed of a single layer of endothelial cells called a monolayer. In straight sections of a blood vessel, vascular endothelial cells ...
The circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate. [ 1 ][ 2 ] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and from Latin vascula ...
Tunica media. Transverse section through a small artery and vein of the mucous membrane of the epiglottis of a child. (Tunica media is at 'm'.) The tunica media (Neo-Latin "middle coat"), or media for short, is the middle tunica (layer) of an artery or vein. [1] It lies between the tunica intima on the inside and the tunica externa on the outside.
Vasa vasorum are small blood vessels that comprise a vascular network supplying the walls of large blood vessels, such as elastic arteries (e.g., the aorta) and large veins (e.g., the venae cavae). The name derives from Latin 'the vessels of the vessels'. Occasionally two different singular forms are seen: vasa vasis (from Latin 'the vessels of ...