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Capillaries quiz

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  • Why do capillaries need to be thin-walled?
    Capillaries need to be thin-walled to facilitate efficient exchange of nutrients and gases between blood and tissues.
  • How thick are the walls of the alveoli and the capillaries?
    The walls of both alveoli and capillaries are extremely thin, consisting of a single layer of cells to allow for efficient gas exchange.
  • What is not true about capillaries?
    They have thick walls is not true; capillaries have thin walls consisting only of the tunica intima.
  • What is a primary function of capillaries?
    Facilitating nutrient and gas exchange is a primary function of capillaries.
  • Which are the thinnest blood vessels?
    Capillaries are the thinnest blood vessels, consisting only of the tunica intima.
  • What is the diameter range of capillaries?
    Capillaries have a diameter range of about 5 to 10 micrometers.
  • What are the three types of capillaries?
    The three types of capillaries are continuous, fenestrated, and sinusoid.
  • Where are fenestrated capillaries commonly found?
    Fenestrated capillaries are commonly found in the kidneys, endocrine glands, and small intestines.
  • What is the function of precapillary sphincters?
    Precapillary sphincters regulate blood flow into capillary beds by contracting to restrict flow.
  • What is microcirculation?
    Microcirculation refers to the blood flow through capillary beds from terminal arterioles to postcapillary venules.