[Campbell Biology P.974] What is the primary advantage of double circulation over single cir... | Practice Question

What is the primary advantage of double circulation over single circulation?

  • A: It allows for a more vigorous flow of blood to the brain, muscles, and other organs.
  • B: It ensures that all blood always passes through two capillary beds before returning to the heart.
  • C: It reduces the overall blood pressure within the circulatory system.
  • D: It entirely prevents the mixing of oxygen-rich and oxygen-poor blood.

Explanation

Double circulation allows the heart to repressurize the blood after it passes through the gas exchange capillaries lungs or skin , ensuring a higher blood pressure in the systemic circuit. This vigorous flow is crucial for delivering oxygen and nutrients efficiently to the brain, muscles, and other organs.