What is the difference between arteries, veins and capillaries? | MyTutor
a system of tubes (arteries, capillaries and veins); a pump (the heart); valves to ensure a one-way Systemic circulation between the heart and other organs. Transcript. How arteries, veins, and capillaries work together. Then it goes through another vein back to the heart. From the heart it goes back to. Explain the structure of arteries, veins, and capillaries and how blood flows which contain capillaries that branch among the cells and tissues of the.
BBC Bitesize - GCSE Biology (Single Science) - The circulatory system - Revision 1
SCAI You may have been told that you had a heart attack or a stroke because of a blocked artery. What exactly is an artery?
Arteries, like veins, are tube-shaped vessels that carry blood in the body. The chief difference between arteries and veins is the job that they do. Arteries carry oxygenated blood away from the heart to the body, and veins carry oxygen-poor blood back from the body to the heart.
Your body also contains other, smaller blood vessels. Here is how blood travels in vessels through the body: Arteries transport blood containing oxygen and nutrients to smaller tubes called arterioles, which then deliver blood to even smaller vessels called capillaries. Capillaries are tiny, thin blood vessels that allow oxygen and nutrients to flow to nearby tissue.
What is the difference between arteries, veins and capillaries?
After the oxygen and nutrients have been delivered to the body's tissues by the capillaries, another network in the body carries blood back to the heart. Small tubes called venules pick up the now oxygen-poor blood and transfer it to the veins, which carry it to the heart. Fluid also crosses into the interstitial space from the capillaries. The capillaries converge again into venules that connect to minor veins, which connect to major veins that take blood high in carbon dioxide back to the heart.
Arteries, Veins, and Capillaries
The major veins drain blood from the same organs and limbs that the major arteries supply. Fluid is also brought back to the heart via the lymphatic system. The structure of the different types of blood vessels reflects their function or layers.
There are three distinct layers, or tunics, that form the walls of blood vessels. The inner, tunica intima is a smooth, inner lining of endothelial cells that are in contact with the red blood cells.
- The circulatory system
- Arteries, Veins, and Capillaries
- What is the difference between an artery and a vein?
This tunic is continuous with the endocardium of the heart. Unlike veins and arteries, capillaries have only one tunic; this single layer of cells is the location of diffusion of oxygen and carbon dioxide between the endothelial cells and red blood cells, as well as the exchange site via endocytosis and exocytosis. The movement of materials at the site of capillaries is regulated by vasoconstrictionnarrowing of the blood vessels, and vasodilationwidening of the blood vessels; this is important in the overall regulation of blood pressure.
Arteries and veins consist of three layers: Capillaries consist of a single layer of epithelial cells, the endothelium tunic tunica intima. Veins and arteries both have two further tunics that surround the endothelium: The elastic, connective tissue stretches and supports the blood vessels, while the smooth muscle layer helps regulate blood flow by altering vascular resistance through vasoconstriction and vasodilation.Operation Ouch - Blood Vessels - Science for Kids