Circulatory System 101

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Questions and Answers

Which type of blood vessel plays a key role in regulating blood pressure by constricting or dilating to control blood flow to capillaries?

  • Arteries (correct)
  • Venules
  • Veins
  • Capillaries

Which type of capillary allows for the passage of large molecules such as proteins and blood cells?

  • Continuous capillaries
  • Sinusoidal capillaries (correct)
  • None of the above
  • Fenestrated capillaries

Which type of vein carries deoxygenated blood from the body back to the heart?

  • Venules
  • Arteries
  • Medium-sized veins
  • Large veins (correct)

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Study Notes

  • The circulatory system is composed of blood and blood vessels.
  • There are three types of blood vessels: arteries, veins, and capillaries.
  • Arteries carry oxygenated blood away from the heart, veins carry deoxygenated blood back to the heart, and capillaries allow for the exchange of nutrients, gases, and waste products between the blood and tissues.
  • Arteries are classified into three types: elastic, muscular, and arterioles.
  • Muscular arteries help regulate blood flow to different parts of the body.
  • Arterioles play a key role in regulating blood pressure by constricting or dilating to control blood flow to capillaries.
  • Veins are classified into three types: venules, medium-sized veins, and large veins.
  • Large veins, such as the superior and inferior vena cava, carry deoxygenated blood from the body back to the heart.
  • Capillaries are classified into three types: continuous, fenestrated, and sinusoidal.
  • Sinusoidal capillaries are the most permeable type and allow for the passage of large molecules such as proteins and blood cells.

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