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Questions and Answers
What is a characteristic of the intima in a medium-sized artery?
What is a characteristic of the intima in a medium-sized artery?
Which of the following is true about the media in a medium-sized artery?
Which of the following is true about the media in a medium-sized artery?
What is a characteristic of the adventitia in a medium-sized vein?
What is a characteristic of the adventitia in a medium-sized vein?
Which of the following is a characteristic of basilar arteries?
Which of the following is a characteristic of basilar arteries?
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What is a characteristic of the lumen in a medium-sized artery?
What is a characteristic of the lumen in a medium-sized artery?
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Which of the following is true about the internal elastic lamina in a medium-sized artery?
Which of the following is true about the internal elastic lamina in a medium-sized artery?
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What is a characteristic of the media in a medium-sized vein?
What is a characteristic of the media in a medium-sized vein?
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Which of the following is true about valves in medium-sized veins?
Which of the following is true about valves in medium-sized veins?
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What is the function of the internal elastic lamina in the tunica intima?
What is the function of the internal elastic lamina in the tunica intima?
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What type of epithelium makes up the innermost layer of the blood vascular system?
What type of epithelium makes up the innermost layer of the blood vascular system?
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What is the main component of the tunica media?
What is the main component of the tunica media?
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What is the outermost layer of the blood vascular system?
What is the outermost layer of the blood vascular system?
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What is unique about the aorta?
What is unique about the aorta?
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What is the characteristic of the tunica intima in the aorta?
What is the characteristic of the tunica intima in the aorta?
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What is the characteristic of the tunica media in the aorta?
What is the characteristic of the tunica media in the aorta?
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What is the characteristic of the tunica adventitia in the aorta?
What is the characteristic of the tunica adventitia in the aorta?
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Study Notes
Blood Vascular System
- The blood vascular system consists of the heart, arterial side, and venous side.
- The arterial side includes the aorta, distributing arteries, arterioles, and arterio-venous connections (capillaries).
- The venous side includes the superior and inferior vena cava, collecting veins, venules, and small venules that end at the arterio-venous connection.
Layers of the Blood Vessel Wall
- The wall of the blood vascular system is formed of three main layers: tunica intima, tunica media, and tunica adventitia.
- Tunica intima is the innermost layer, formed of simple squamous epithelium (endothelium) and a sub-endothelial layer of areolar connective tissue.
- Internal elastic lamina is the most external component of tunica intima, preventing complete occlusion of vessels during contraction.
- Tunica media is the middle layer, formed of circularly arranged smooth muscles, a variable amount of connective tissue, and external elastic lamina.
- Tunica adventitia is the outermost layer, formed of areolar connective tissue containing blood vessels (Vasa vasorum) and nerves.
Characteristics of the Aorta
- The aorta is a long, elastic artery with a wide lumen.
- It has a very thick elastic wall.
- The intima is thick, consisting of endothelium, subendothelium, and an unapparent internal elastic lamina.
- The media is very thick, formed of circularly arranged perforated elastic lamina with smooth muscle fibers in between, and an unapparent external elastic lamina.
- The adventitia is thin, formed of fibro-elastic connective tissue containing Vasa vasorum and nerves.
Medium-Sized Artery
- It has a thick wall but a narrow lumen.
- It has no valve in its lumen.
- The intima is thick and folded, consisting of endothelium, subendothelium, and an internal elastic lamina.
- The media is thick, consisting of circularly arranged smooth muscle fibers with some elastic fibers and an external elastic lamina.
- The adventitia is thin, containing elastic fibers and nerves.
Medium-Sized Vein
- It has a thin wall but a wide lumen.
- Valves may be present in some veins.
- The intima is thin, not folded, and has no internal elastic lamina.
- The media is thin, with no external elastic lamina.
- The adventitia is thick, rich in collagen fibers, with Vasa vasorum and nerve fibers.
Comparison of Medium-Sized Artery and Vein
- The wall of the medium-sized artery is thicker, while the wall of the medium-sized vein is thinner.
- The lumen of the medium-sized artery is narrower, while the lumen of the medium-sized vein is wider.
- The intima of the medium-sized artery is thicker, while the intima of the medium-sized vein is thinner.
- The internal elastic lamina is present in the medium-sized artery but absent in the medium-sized vein.
- The media of the medium-sized artery is thicker, with elastic fibers and smooth muscles, while the media of the medium-sized vein is thinner, with fewer elastic fibers.
- The adventitia of the medium-sized artery is thinner, with more elastic fibers, while the adventitia of the medium-sized vein is thicker, with more collagenous fibers and Vasa vasorum.
- Valves are absent in the medium-sized artery but may be present in the medium-sized vein.
Basilar Artery
- It supplies the brain tissue.
- It has a thin wall, thin intima, thin media, and thin adventitia.
- It has a well-developed internal elastic lamina.
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Description
This quiz covers the structure and components of the blood vascular system, including the heart, arteries, arterioles, capillaries, veins, and more.