Key Takeaways Key Points.

The innermost tunic is the tunica intima.

Differentiate among the structure of arteries, veins, and capillaries. The walls of all blood vessels, except the smallest, have three layers, or tunics, that surround a central blood-containing space, the vessel lumen. Structure and Function of Blood Vessels.

Capillaries are the smallest blood vessels in the body, connecting the smallest arteries to the smallest veins. Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Example – Very fine branches of capillary specifically perform the function of exchange of gases.

Shared Structures. There are three sorts of blood vessels in our body – arteries, capillaries, and veins. Structure of Blood Vessel Walls. Blood vessels function to transport blood.In general, arteries and arterioles transport oxygenated blood from the lungs to the body and its organs, and veins and venules transport deoxygenated blood from the body to the lungs.Blood vessels also circulate blood throughout the circulatory system Oxygen (bound to hemoglobin in red blood cells) is the most critical nutrient carried by the blood.

Their thin walls allow oxygen, nutrients, carbon dioxide, and other waste to pass to and from cells. Blood vessels consist of arteries, arterioles, capillaries, venules, and veins.

(c) A micrograph shows the relative differences in thickness. The tunica intima contains the endothelium, the simple squamous epithelium that lines the lumen of all vessels. The veins comprise a system of vessels which collect the blood from the capillaries and return it to the heart. Blood vessels perform their function and are allowed specific functions in different parts. By the end of this section, you will be able to: Compare and contrast the three tunics that make up the walls of most blood vessels; Distinguish between elastic arteries, muscular arteries, and arterioles on the basis of structure, location, and function; Veins are vessels that return blood to the heart.
Learning Objectives. The final part of the lesson looks at the role of the capillaries in exchange. Blood vessels function to transport blood.In general, arteries and arterioles transport oxygenated blood from the lungs to the body and its organs, and veins and venules transport deoxygenated blood from the body to the lungs.Blood vessels also circulate blood throughout the circulatory system Oxygen (bound to hemoglobin in red blood cells) is the most critical nutrient carried by the blood.

Veins.

Blood vessel, a vessel in the human or animal body in which blood circulates.

... Each has a slightly different structure that allows to function in a unique way.

(c) A micrograph shows the relative differences in thickness. (a) Arteries and (b) veins share the same general features, but the walls of arteries are much thicker because of the higher pressure of the blood that flows through them. Definition of the human blood circulation , veins and their special features , direction of blood flow . LM × 160. The veins, however, have …

Structure of Blood Vessels. Learn more about the anatomy and types of blood vessels and the diseases that affect them. Structure and Function of Blood Vessels.

Blood Vessel Structure. Blood vessels are flexible tubes that carry blood, associated oxygen, nutrients, water, and hormones throughout the body. Different types of blood vessels vary slightly in their structures, but they share the same general features. Moving forwards, the lesson considers the structure of the veins and students are challenged to explain how the differences to those observed in arteries is due to the lower blood pressure found in these vessels.

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