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In the lungs, which type of blood vessel forms the dense network that surrounds (covers) the alveoli to allow rapid gas exchange?
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19. The Blood Vessels
Capillaries
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Which type of capillary is characterized by a discontinuous basement membrane, allowing for the easy passage of larger molecules and cells?
A
Continuous capillaries.
B
Fenestrated capillaries.
C
Sinusoid capillaries.
D
Muscular capillaries.
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Understand the function of capillaries: Capillaries are small blood vessels where the exchange of gases, nutrients, and waste occurs between blood and tissues.
Identify the types of capillaries: There are three main types of capillaries - continuous, fenestrated, and sinusoid.
Define continuous capillaries: These have a continuous basement membrane and endothelial lining, allowing only small molecules to pass through.
Define fenestrated capillaries: These have pores in the endothelial cells, allowing for increased permeability, but the basement membrane remains continuous.
Define sinusoid capillaries: These have a discontinuous basement membrane and large openings, allowing for the passage of larger molecules and cells, such as in the liver, spleen, and bone marrow.
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