36 Questions
Where are continuous capillaries primarily found?
Skin
Which type of capillary has endothelial cells with numerous circular openings?
Fenestrated capillaries
What is the main function of fenestrated capillaries?
Metabolic exchange
What structures join the endothelial cells in continuous capillaries?
Occluding junctions
Which of the following tissues lacks continuous capillaries?
Liver
What is the composition of the tunica intima in large elastic arteries?
Endothelium supported by a subendothelial layer
Which layer constitutes 70% of the wall thickness in large elastic (conducting) arteries?
Tunica media
What is the function of the smooth muscle in blood vessels?
Provides mechanical strength to the wall
In what layer of the blood vessel wall would one find vasa vasorum?
Tunica adventitia
What characterizes medium-sized muscular (distributing) arteries?
Prevalence of fibroblasts in the tunica adventitia
What is the function of the elastic lamina in the wall of large arteries?
Enable inflation of the arteries during systole
Which type of artery has a relatively thin tunica intima?
Medium muscular arteries
What is the composition of the tunica media in medium-sized muscular arteries?
Mainly smooth muscle fibers with little elastic and collagen fibers
What is the function of vasa vasorum in the wall of arteries?
Provide nutrition to the adventitia and outer media
Where are numerous vasa vasorum found in the arterial wall?
Within the tunica adventitia
What is the main function of the internal elastic lamina in the tunica intima of arteries?
Facilitating nutrient exchange
In medium-sized veins, what is the role of the valves projecting into the lumen?
Promoting blood flow to the heart
Which component makes up about 30% of the wall thickness in both arteries and medium-sized veins?
Elastic fibers
What is the main function of vasa vasorum found more abundantly in the tunica adventitia of medium-sized veins than in arteries?
Increasing vessel strength
How does the composition of the tunica media differ between arteries and medium-sized veins?
Smooth muscle-rich in arteries, collagen-rich in veins
What is responsible for peripheral resistance in arterioles?
Tunica Media
What is the slight thickening of smooth muscle at the origin of a capillary bed from an arteriole called?
Precapillary Sphincter
Which layer of veins has a collapsed lumen that may contain RBCs and is not circularly opened like arteries?
Tunica Intima
What is the caliber comparison between veins and arteries based on the text?
Veins have larger caliber than arteries
Which layer of veins is described as having walls much thinner than arteries?
Tunica Media
What type of cells form the innermost layer of the blood vessel wall?
Simple squamous epithelial cells
Which layer of the blood vessel wall contains concentric layers of spirally-oriented smooth muscle fibers?
Tunica media
What is the function of the internal elastic lamina present in many arteries?
To permit diffusion of substances into deeper regions of the arterial wall
Which type of arteries contain an internal elastic lamina?
Large arteries
What type of junctions join the endothelial cells together in the tunica intima?
Occluding junctions
What is the distinguishing feature of muscular venules compared to post-capillary venules?
Presence of a single layer of smooth muscle fibers in the media
Which statement accurately describes the histological structure of capillaries?
External surfaces are surrounded by a basal lamina
What is the primary function of pericytes associated with capillaries and post-capillary venules?
Support of capillaries and post-capillary venules
Which layer is thinner in muscular venules compared to post-capillary venules?
Tunica adventitia
What is a distinguishing characteristic of capillaries on the external surfaces of endothelial cells?
Large number of pinocytotic vesicles
Which type of blood vessels are the site of trans-migration of white blood cells during inflammation?
Post-capillary venules
Test your knowledge on the structure of blood vessels, including the roles of smooth muscle, collagen, elastic fibers, and extracellular matrix in the vessel wall layers.
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