[Campbell Biology P.985] The text describes blood clotting as involving a positive feedback ... | Practice Question

The text describes blood clotting as involving a positive feedback loop. What is the significance of this positive feedback in the clotting process?

  • A: It ensures that the clot formation is quickly reversed once the injury is healed.
  • B: It rapidly amplifies the conversion of prothrombin to thrombin, accelerating clot formation.
  • C: It reduces the amount of clotting factors needed, making the process more efficient.
  • D: It allows for the controlled and gradual dissolution of the clot over time.

Explanation

The text explicitly states: 'thrombin itself stimulates the enzymatic cascade, leading to more conversion of prothrombin to thrombin and thus driving clotting to completion.' This is the definition and effect of a positive feedback loop: amplification and acceleration of the process.