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Questions and Answers
What is the main structural difference between post-capillary venules and muscular venules?
What is the main structural difference between post-capillary venules and muscular venules?
- Post-capillary venules have a thick adventitia, while muscular venules have a thin adventitia.
- Muscular venules contain pericytes while post-capillary venules do not.
- Post-capillary venules are larger in diameter compared to muscular venules.
- Post-capillary venules have a single layer of endothelial cells, while muscular venules have smooth muscle fibers in the media. (correct)
Which of the following accurately describes the histological structure of capillaries?
Which of the following accurately describes the histological structure of capillaries?
- Capillaries have two layers of smooth muscle fibers in the media and a thick basal lamina.
- Capillaries are surrounded by pericytes that form the endothelial layer.
- Capillaries have a lumen diameter ranging from 8 to 10 mm and are formed by a single layer of squamous endothelial cells. (correct)
- Capillaries have a thick adventitia and are connected to muscular venules.
What is the role of pericytes in the circulatory system?
What is the role of pericytes in the circulatory system?
- Pericytes are responsible for oxygen exchange in the capillaries.
- Pericytes help regulate blood flow by contracting or relaxing the precapillary sphincters.
- Pericytes provide structural support to capillaries and post-capillary venules. (correct)
- Pericytes produce red blood cells in the bone marrow.
How do post-capillary venules differ from arterioles in terms of structure?
How do post-capillary venules differ from arterioles in terms of structure?
Which layer of the vascular channels conducts blood from terminal arterioles to post-capillary venules?
Which layer of the vascular channels conducts blood from terminal arterioles to post-capillary venules?
What type of capillary has endothelial cells joined together by occluding junctions?
What type of capillary has endothelial cells joined together by occluding junctions?
Where are fenestrated capillaries found?
Where are fenestrated capillaries found?
What is the function of arterioles in the cardiovascular system?
What is the function of arterioles in the cardiovascular system?
What is the function of continuous capillaries?
What is the function of continuous capillaries?
Which type of capillary is characterized by numerous fenestrations?
Which type of capillary is characterized by numerous fenestrations?
Which histological feature characterizes arterioles compared to other blood vessels?
Which histological feature characterizes arterioles compared to other blood vessels?
What regulates the blood flow into capillary beds through the closure or opening of precapillary sphincters?
What regulates the blood flow into capillary beds through the closure or opening of precapillary sphincters?
What is the role of cytoskeleton in regulating blood flow through capillaries?
What is the role of cytoskeleton in regulating blood flow through capillaries?
In histological sections, what distinguishes the lumen of veins from that of arteries?
In histological sections, what distinguishes the lumen of veins from that of arteries?
How are veins classified based on their diameter and wall thickness?
How are veins classified based on their diameter and wall thickness?
Which type of blood vessel is characterized by irregular vascular channels with large openings in endothelial cells and wide intercellular gaps?
Which type of blood vessel is characterized by irregular vascular channels with large openings in endothelial cells and wide intercellular gaps?
Which blood vessel structure has a relatively thick smooth muscle layer and is responsible for thermoregulation at the body surface?
Which blood vessel structure has a relatively thick smooth muscle layer and is responsible for thermoregulation at the body surface?
Which feature is unique to arteriovenous (A-V) shunts compared to ordinary precapillary sphincters?
Which feature is unique to arteriovenous (A-V) shunts compared to ordinary precapillary sphincters?
In which type of blood vessel would you find delicate reticular fibers supporting the endothelial cells?
In which type of blood vessel would you find delicate reticular fibers supporting the endothelial cells?
Which blood vessel structure has endothelial cells that rest on a discontinuous basal lamina and are separated by wide intercellular gaps?
Which blood vessel structure has endothelial cells that rest on a discontinuous basal lamina and are separated by wide intercellular gaps?
Which layer of arterioles is characterized by a thin layer with no internal elastic lamina?
Which layer of arterioles is characterized by a thin layer with no internal elastic lamina?
What is the composition of the tunica adventitia in medium-sized veins?
What is the composition of the tunica adventitia in medium-sized veins?
What function do the valves in medium-sized veins serve?
What function do the valves in medium-sized veins serve?
What is the percentage of the wall thickness that the tunica media occupies in arterioles?
What is the percentage of the wall thickness that the tunica media occupies in arterioles?
Which type of blood vessel contains more vasa vasorum in the tunica adventitia, veins or arteries?
Which type of blood vessel contains more vasa vasorum in the tunica adventitia, veins or arteries?
What is the main function of the elastic laminae in the wall of large arteries?
What is the main function of the elastic laminae in the wall of large arteries?
In medium-sized muscular arteries, what is a prominent feature of the tunica intima?
In medium-sized muscular arteries, what is a prominent feature of the tunica intima?
What is the composition of the tunica media in medium-sized muscular arteries?
What is the composition of the tunica media in medium-sized muscular arteries?
Which characteristic is true about the tunica adventitia of medium-sized muscular arteries?
Which characteristic is true about the tunica adventitia of medium-sized muscular arteries?
What plays a crucial role in providing nutrition to the adventitia and outer part of the media in large arterial walls?
What plays a crucial role in providing nutrition to the adventitia and outer part of the media in large arterial walls?
What is the main component of the tunica intima in arteries?
What is the main component of the tunica intima in arteries?
Which layer of the artery constitutes 70% of the wall thickness?
Which layer of the artery constitutes 70% of the wall thickness?
What provides mechanical strength to the wall and controls the luminal diameter of blood vessels?
What provides mechanical strength to the wall and controls the luminal diameter of blood vessels?
Which layer of the artery contains vasa vasorum, small blood vessels providing nutrition to the vessel wall?
Which layer of the artery contains vasa vasorum, small blood vessels providing nutrition to the vessel wall?
In arteries, what separates the media from the adventitia in many cases?
In arteries, what separates the media from the adventitia in many cases?
Which type of arteries include the aorta and its large branches?
Which type of arteries include the aorta and its large branches?
What are small blood vessels called that provide nutrition to the vessel wall?
What are small blood vessels called that provide nutrition to the vessel wall?
Which layer of the blood vessel wall blends into the surrounding connective tissue?
Which layer of the blood vessel wall blends into the surrounding connective tissue?
What is the main component of tunica media in arteries?
What is the main component of tunica media in arteries?
Which type of arteries have the general histological structure of a blood vessel?
Which type of arteries have the general histological structure of a blood vessel?
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