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MDCAT Biology QUESTION #4302
Question 1
Which of the following blood vessels have the lowest blood velocity, with correct reason?
  • Arteries: Due to thick walls
  • Capillaries: due to highest overall cross-sectional area✔️
  • Veins: due to blood flow against gravity
  • Capillaries: Due to two-way blood flow in capillaries
Correct Answer Explanation
Blood velocity is lowest in capillaries because the total cross-sectional area of all capillaries combined is the greatest, so by continuity, blood slows down significantly.