An artery is the main blood vessel that transports oxygenated blood away from the heart. Its smooth muscle walls make it flexible and bendable, allowing it to pass through places where it would otherwise be impractical. Arteries also have an internal hollow cavity known as the lumen, which carries nutrients and gases from the heart to the body. However, some people confuse the difference between arteries and veins. This article will provide a clear explanation of these two structures.
Veins carry deoxygenated blood
Veins transport deoxygenated blood. Veins take blood from the heart to the lungs and return it to the body. Arteries carry oxygenated blood, while veins carry deoxygenated blood. In addition, the pulmonary vein carries oxygenated blood from the lungs back to the heart. The pulmonary vein also carries blood from the hands and feet to the heart. In addition to carrying oxygenated blood, veins also carry carbon dioxide.
The vena cava is the largest vein in the human body. It transports deoxygenated blood from the lower half of the body to the heart. It is formed at the lowest point of the body where the left and right common iliac veins converge. It begins posterior to the abdominal cavity and travels to the heart next to the aorta. It also receives blood from the renal, suprarenal, and hepatic veins.
Arteries carry oxygen-rich blood away from the heart
The human body contains four major arteries: the aorta, pulmonary artery, and vena cava. Each artery carries blood to and from the heart. Blood in the right atrium travels through the pulmonary artery, which picks up oxygen-rich blood from the right ventricle. Meanwhile, the deoxygenated blood travels through the pulmonary artery to the left side of the heart.
When blood returns to the heart, it has picked up oxygen from the lungs. Once oxygenated, the blood is ready to go out to the rest of the body. The aorta branches into smaller veins, which send blood to all parts of the body. The smallest veins, called venules, are connected to the small branches of the arteries. The smaller veins, called capillaries, carry nutrients and waste products to cells and tissues.
Arteries are comprised of smooth muscle
While veins have smooth muscle, arteries have a thicker wall and more elastic tissue. Arteries are the main blood vessels that carry pumped blood away from the heart. They also protect venules and capillaries by reducing blood pressure at the periphery. The walls of arteries are essentially the same as those of veins, with the exception that arteries are longer than veins.
The innermost layer of an artery is called the tunica intima. It is composed of smooth muscle cells, elastic fibers, and connective tissue. The tunica media of an artery is composed mostly of smooth muscle, while the outer tunica, or outer layer, contains collagen fibres and elastic fibers. Arteries contain two tunics, the tunica media and the tunica adventitia, which connect the artery to the surrounding tissue.
They carry nutrients and gases
The capillaries are vessels that allow fluid to move freely and exchange gases and nutrients between them. The Starling principle, named after physiologist Ernest Starling, describes how fluid moves through capillary walls. The pressures exerted on these vessels are hydrostatic and oncotic. The movement of blood in and out of capillaries depends on both of these pressures. They are found throughout the body. The heart beats 70 times per minute.