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By The Editors of Encyclopaedia Britannica Edit History Table of Contents circulatory system See all media Key People:Michael DeBakey Alexis Carrel...(Show more)Related Topics:artery blood pressure vein capillary sinusoid...(Show more) See all related content → blood vessel, a vessel in the human or animal body in which blood circulates. The vessels that carry blood away from the heart are called arteries, and their very small branches are arterioles. Very small branches that collect the blood from the various organs and parts are called venules, and they unite to form veins, which return the blood to the heart. Capillaries are minute thin-walled vessels that connect the arterioles and venules; it is through the capillaries that nutrients and wastes are exchanged between the blood and body tissues. The inner surface of every blood vessel is lined by a thin layer of cells known as the endothelium. The endothelium is separated from the tough external layers of the vessel by the basal lamina, an extracellular matrix produced by surrounding epithelial cells. The endothelium plays a critical role in controlling the passage of substances, including nutrients and waste products, to and from the blood. Under certain circumstances, tissues may grow new blood vessels, a process known as angiogenesis. Angiogenesis plays an important role in the replacement of damaged tissue but also occurs under abnormal conditions, such as in tumour growth and progression. Britannica Quiz The Human Body You may know that the human brain is composed of two halves, but what fraction of the human body is made up of blood? Learn this fact and much more as you test both halves of your mind in this human anatomy quiz. In humans, the function and structure of blood vessels can be affected by a number of different diseases and conditions. Some examples include inflammation; atherosclerosis, which involves the deposition of fat in the arterial endothelium; and hypertension, in which narrowing of the arterioles causes an abnormal increase in blood pressure. Seeartery; capillary; vein; cardiovascular disease. What best describes a capillary?What are capillaries? Capillaries are delicate blood vessels that exist throughout your body. They transport blood, nutrients and oxygen to cells in your organs and body systems. Capillaries are the smallest blood vessels in your vascular system.
What describes a capillary quizlet?Capillaries. An exchange system of very small-diameter vessels that form branching networks where gases, nutrients, wastes, and other molecules are quickly exchanged between tissue cells and blood; walls are only a single cell thick.
Which of the following is the best description of what happens in capillaries?Answer and Explanation:
These capillaries help to connect the arteries and the veins. These obtain oxygenated blood from the heart through the network of other blood vessels and transfer it to tissues of the body.
Which of the following best describes the function of the capillary system?Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.
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Which of these best describes capillaries?
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