Blood vessels are found throughout your body and are continuous.
The blood vessels run throughout the body and are tubular in shape , this tubular system is continuous with no openings and so is at times referred to as a closed system. In the main there are three types of blood vessel, Arteries, veins and capillaries, there are also arterioles and venules which are small branches from arteries and veins that connect to capillaries. There are abbreviations that are used for blood vessels , A=artery, V =vein, Aa=arteries, Vv=veins, NAVL. The blood vessels walls are generally constructed of three layers , the inner most wall is called the intima the main part of the wall is called media and the outer layer is called the adventita . Arteries and veins which have a similar inner size , the artery will have a thicker wall due to the smooth muscle tissue and the presents of elastic FCT which is a element of the artery make up. The capillary walls have only one layer which is called the intima. Capillary networks are called beds which are the exchange areas for the cardiovascular system, the capillary walls consists of flat single cells, substances move between the blood and the body cells.
What pressure are the artery's and vessels under.
The blood vessels are tubular structures throughout the entire body.
Since this tubular system is continuous (without interruption or opening), we sometimes refer to it as a closed system.
Types of Blood Vessels
In general, there are three types of blood vessels--arteries, veins, and capillaries.
We use the following abbreviations:
A. = artery V. = vein
Aa. = arteries Vv. = veins
NAVL = nerve(s), artery(ies), vein(s), lymphatic(s)
Structure of Blood Vessels
In general, blood vessels have a walls composed of three layers as follows:
• Intima - The innermost layer is the intima. The intima is a simple epithelium made up of a single layer of flat epithelial cells.
• Media - The main portion of the wall is the media. It is made up of a combination of FCT and smooth muscle tissue.
• Adventitia - The outer surface of the blood vessel is the adventitia. It is an FCT layer.
Structures of Arteries and Veins
Given an artery and a vein with similar inner diameters, the artery will have a thicker wall than the vein.
This greater thickness is due to the presence of more smooth muscle tissue and the presence of elastic FCT as a significant element.
Capillary walls have only one layer--the intima.
Capillary networks (beds) are the exchange areas for the cardiovascular system.
This includes the internal exchange areas between the blood and the individual cells of the body.
Since the capillary wall consists of flat single cells, substances can move readily between the body cells and the blood.
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