What is the thickest layer in the artery and vein?

What is the thickest layer in the artery and vein?

What is the thickest layer in the artery and vein?

tunica media
The tunica media is the substantial middle layer of the vessel wall (see Figure 2). It is generally the thickest layer in arteries, and it is much thicker in arteries than it is in veins.

What is the thickest layer in veins?

tunica adventitia
The outer layer (tunica adventitia) consists chiefly of connective tissue and is the thickest layer of the vein. As in arteries, there are tiny vessels called vasa vasorum that supply blood to the walls of the veins and other minute vessels that carry blood away.

Which blood vessels have the thickest muscle lining?

Shared Structures

Comparison of Tunics in Arteries and Veins
Arteries
Tunica media Normally the thickest layer in arteries Smooth muscle cells and elastic fibers predominate (the proportions of these vary with distance from the heart) External elastic membrane present in larger vessels

How thick are veins compared to arteries?

Veins are generally larger in diameter, carry more blood volume and have thinner walls in proportion to their lumen. Arteries are smaller, have thicker walls in proportion to their lumen and carry blood under higher pressure than veins. Arteries and veins often travel in pairs using the same connective tissue pathways.

Which blood vessels are the thinnest?

Arterial blood flow and venous blood flow are connected by capillaries which are the smallest and thinnest blood vessels of the body. Capillaries also supply blood to the walls of blood vessels.

What are the two major factors affecting blood flow rate?

Pulse, the expansion and recoiling of an artery, reflects the heartbeat. The variables affecting blood flow and blood pressure in the systemic circulation are cardiac output, compliance, blood volume, blood viscosity, and the length and diameter of the blood vessels.