18 Questions
Where are sinusoidal capillaries mainly found?
Bone marrow
What is a unique characteristic of fenestrated capillaries?
Endothelial cells have large openings without diaphragms
What is the primary function of continuous capillaries?
Allows more molecular exchange between tissues and blood
Which type of capillaries serve in thermoregulation at the body surface?
AV shunts
Where do fenestrated capillaries play a significant role in molecular exchange?
Liver
Which type of capillary has a characteristic of direct routes between arterioles and venules without passing in the capillary bed?
AV shunts
Which type of capillaries has endothelial cells joined together by occluding junctions?
Continuous capillaries
In which type of capillaries are the fenestrations closed by a thin non-membranous diaphragm?
Fenestrated capillaries
Which type of capillaries has the wall without fenestrations and contains numerous pinocytotic vesicles for molecule transport?
Continuous capillaries
Where are fenestrated capillaries commonly found?
Lung and skin
Which type of capillaries is known to share in the formation of blood barriers like the blood-brain barrier?
Continuous capillaries
In which type of capillaries may pericytes undergo differentiation to become smooth muscle cells and endothelial cells?
Sinusoidal capillaries
What is the histological structure of capillaries?
Single layer of squamous endothelial cells with a lumen diameter of 8 to 10 mm
Which type of capillary has the identifying characteristic of a large number of pinocytotic vesicles associated with the entire plasmalemma?
Continuous capillaries
What is the function of pericytes in capillaries and post-capillary venules?
Supporting the structures with branching cytoplasmic processes
Which type of capillary does not have continuous endothelium but contains fenestrations or pores?
Fenestrated capillaries
In peripheral circulation, what do arteriovenous shunts connect?
Arteries and veins
What is the main site for trans-migration of white blood cells during inflammation?
Capillaries
This quiz covers the classification of capillaries into continuous, fenestrated, and sinusoidal types, along with their structures and functions. Topics include the role of the cytoskeleton in regulating blood flow and the differentiation of pericytes in tissue repair.
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