What are the features of elastic arteries?
What are the features of elastic arteries?
Elastic arteries contain larger numbers of collagen and elastin filaments in their tunica media than muscular arteries do, giving them the ability to stretch in response to each pulse. Elastic arteries include the largest arteries in the body, those closest to the heart, and give rise to the smaller muscular arteries.
What is the function of elastic artery?
Elastic arteries are those nearest the heart (aorta and pulmonary arteries) that contain much more elastic tissue in the tunica media than muscular arteries. This feature of the elastic arteries allows them to maintain a relatively constant pressure gradient despite the constant pumping action of the heart.
What are elastic arteries made of?
The walls of elastic arteries are composed of three layers: (1) the tunica intima, which is a single-cell layer of endothelial cells adjacent to the arterial lumen; (2) the tunica media, which is composed of concentric layers of collagen and elastic fibers composed of smooth muscle cells and elastin; and (3) the tunica …
What type of vessel is elastic artery?
Elastic arteries include the largest arteries in the body, those closest to the heart. They give rise to medium-sized vessels known as distributing arteries (or muscular arteries)….
Why are arteries elastic in nature?
Why are arteries thick elastic?
So, the answer to the question as to why are arteries thicker than veins is that because arteries have higher blood pressure. The elasticity and the muscular nature provides the arteries with the flexibility to withstand the extreme pressure and pressure changes during the blood flow.
What is the difference between elastic and muscular arteries?
In contrast to the mechanism elastic arteries use to store and dissipate energy generated by the heart’s contraction, muscular arteries contain layers of smooth muscle providing allowing for involuntary control of vessel caliber and thus control of blood flow.
Is the coronary artery elastic or muscular?
These arteries distribute blood to various parts of the body. These include arteries such as the femoral and coronary arteries. The walls of these arteries have lots of smooth muscle, which means that they are able to contract or relax (dilate) to change the amount of blood delivered, as needed.
What do you need to know about elastic arteries?
Key Terms 1 elastic arteries: An artery with a large number of collagen and elastin filaments, giving it the ability to stretch in… 2 tunica media: The middle layer of a vein wall with bands of thin smooth muscle. More …
Is the aorta part of the elastic artery system?
Elastic artery. The pulmonary arteries, the aorta, and its branches together comprise the body’s system of elastic arteries. Elastic arteries receive their own blood supply by the vasa vasorum unlike smaller blood vessels, which are supplied by diffusion .
Is the tunica media thick as elastic arteries?
Generally, the tunica media of muscular arteries is not thick as elastic arteries and it is composed of 3-10 layers of alternative smooth muscles and elastic fiber layers.
How are smooth muscle cells arranged in elastic arteries?
The pulmonary arteries, the aorta, and its branches together comprise the body’s system of elastic arteries. In these large arteries, the amount of elastic tissue is considerable and the smooth muscle fiber cells are arranged in 5 to 7 layers in both circular and longitudinal directions.
Size is another difference between elastic and muscular arteries. Elastic arteries are large, >10 mm in diameter, while muscular arteries are comparatively small, 0.1–10 mm in diameter.
Why do arteries have to be elastic?
Arteries play a major role in nourishing organs with blood and nutrients. Arteries are always under high pressure. To accommodate this stress, they have an abundance of elastic tissue and less smooth muscle. The presence of elastin in the large blood vessels enables these vessels to increase in size and alter their diameter.
How do elastic arteries function as?
Similarities Between Elastic and Muscular Arteries Elastic and muscular arteries are two types of arteries in the circulatory system of the body. Their main function is to transport oxygenated blood from the heart to the organs. The wall of both these arteries is composed of three layers: tunica externa, tunica media, and tunica intima.
Why are the walls of arteries thick and elastic?
Thick walls of arteries help them to resist the pressure of flow of blood in them . Arteries are elastic so as to produce enough pressure to push the blood and help it flow.