Define Blood Vessels
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The blood vessels are part of the circulatory system and function to transport blood throughout the body. The most important types, arteries and veins, carry blood away from or towards the heart, respectively. All blood vessels have the same basic structure.
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The blood vessels are part of the circulatory system and function to transport blood throughout the body. The most important types, arteries and veins, carry blood away from or towards the heart, respectively. All blood vessels have the same basic structure.
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Blood Vessels help in transporting blood to the entire body. It is a part of a circulatory system which is tubular in structure.
Types of Blood Vessels
Arteries
Capillaries
Veins
Sinusoids
Arteries: Its function is to carry blood from the heart. They are very flexible and strong. They eventually branch into smaller branches called arterioles.
Capillaries: It allows the switching of chemicals and water between the tissues and blood. They are very thin and tiny. Exchange of blood takes place between blood tissues and capillaries. This function takes place at capillary beds. Connective tissues are also found occasionally.
Veins: It carries blood from the capillaries back towards the heart. They have much slighter walls compared to arteries.
Sinusoids: They are very small vessels located within the bone marrow, liver and spleen.
Layers of Blood Vessels
Both arteries and veins consist of three layers.
Tunica Intima: It is one of the innermost and thinnest layers of arteries and veins. It comprises of endothelial cells. They are in direct contact with the flow of blood. It intern consists of three layers. I.e. Inner Layer, Middle Layer, and Outer Layer.
Tunica Media: It is one of the thickest layers of arteries. Its function is to control the caliber of the vessel. It also consists of connective tissue and polysaccharide substances.
Tunica Adventitia: It controls the caliber of the vessel. It is surrounded by the tunica media. It comprises of collagen and also supported by the lamina.
Types of Blood Vessels
Arteries
Capillaries
Veins
Sinusoids
Arteries: Its function is to carry blood from the heart. They are very flexible and strong. They eventually branch into smaller branches called arterioles.
Capillaries: It allows the switching of chemicals and water between the tissues and blood. They are very thin and tiny. Exchange of blood takes place between blood tissues and capillaries. This function takes place at capillary beds. Connective tissues are also found occasionally.
Veins: It carries blood from the capillaries back towards the heart. They have much slighter walls compared to arteries.
Sinusoids: They are very small vessels located within the bone marrow, liver and spleen.
Layers of Blood Vessels
Both arteries and veins consist of three layers.
Tunica Intima: It is one of the innermost and thinnest layers of arteries and veins. It comprises of endothelial cells. They are in direct contact with the flow of blood. It intern consists of three layers. I.e. Inner Layer, Middle Layer, and Outer Layer.
Tunica Media: It is one of the thickest layers of arteries. Its function is to control the caliber of the vessel. It also consists of connective tissue and polysaccharide substances.
Tunica Adventitia: It controls the caliber of the vessel. It is surrounded by the tunica media. It comprises of collagen and also supported by the lamina.
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