Q:

Different types of capillaries are distinguished by their structure. Which of the following is NOT a structural difference between capillaries?

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Different types of capillaries are distinguished by their structure. Which of the following is NOT a structural difference between capillaries?


  1. The endothelial cells of some capillaries are joined by tight junctions while for others there are gaps between the cells.
  2. Some capillaries have pores that allow movement between the plasma and interstitial fluid.
  3. Some capillaries have an arterial end and a venous end, while others begin in the tissues and drain into a venule.
  4. Some capillaries are surrounded by a basement membrane while others are not.

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C: No capillaries “start” in the tissues. Continuous capillaries are joined by tight junctions; fenestrated capillaries have pores; sinusoid capillaries may have no basement membrane.

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