Which type of blood vessel has the most elastic fibers?

Which type of blood vessel has the most elastic fibers?

Which type of blood vessel has the most elastic fibers?

All arteries have relatively thick walls that can withstand the high pressure of blood ejected from the heart. However, those close to the heart have the thickest walls, containing a high percentage of elastic fibers in all three of their tunics. This type of artery is known as an elastic artery ((Figure)).

Do veins have many elastic fibers?

Tunica Media This layer is much thicker in arteries than in veins. Fiber composition also differs; veins contain fewer elastic fibers and function to control caliber of the arteries, a key step in maintaining blood pressure.

Why do artery walls need to be elastic?

Since they must receive the blood directly from the heart which pumps the blood at a pressure sufficient to enable circulation, they need thick and elastic walls to both sustain the pressure (and so keep the blood flowing) and to withstand the pressure (and not get affected by the pressure).

Which is more elastic artery or vein?

As heart pumps out blood through arteries to different parts of the body, thereby blood flows in high pressure in arteries and can withstand ,so its more elastic than veins. If they are not elastic than they would rupture due to pressure. For smooth functioning they are more elatic than viens.

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)….

Elastic artery
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Anatomical terminology

Which is an example of a large elastic artery?

large elastic arteries (aorta, large aortic branches [e.g. innominate, subclavian, common carotids, iliacs] and pulmonary arteries): the media is abundant in elastic fibers that allow it to expand with systole and recoil during diastole, thereby propelling blood forward.

How does elastin affect the size of blood vessels?

Arteries 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.

Which is the blood vessel closest to the heart?

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.

How are blood vessels similar in structure and function?

Different types of blood vessels vary slightly in their structures, but they share the same general features. Arteries and arterioles have thicker walls than veins and venules because they are closer to the heart and receive blood that is surging at a far greater pressure ( (Figure) ).

Which is the most elastic artery in the body?

In elastic arteries, the tunica media is rich with elastic and connective tissue. The aorta: The aorta makes up most of the elastic arteries in the body.

How is connective tissue used to keep blood vessels in place?

The space between the formed elements of the tissue is filled with the matrix. The material in the connective tissue gives it a loose consistency similar to a cotton ball that has been pulled apart. Loose connective tissue is found around every blood vessel and helps to keep the vessel in place.

What kind of fibers are found in connective tissues?

When a connective tissue has a high concentration of cells or fibers, it has proportionally a less dense matrix. The organic portion or protein fibers found in connective tissues are either collagen, elastic, or reticular fibers.

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.