Before You Begin
Question #46393
The Question
In the evolutionary context of hemostasis, the vertebrate blood coagulation mechanism differs significantly from the hemolymph clotting observed in most non-chordates. Which of the following statements correctly identifies this evolutionary shift regarding the extrinsic pathway?
Options
- A.
Vertebrate coagulation is an analogous process to non-chordate clotting, as both rely primarily on the direct agglutination of formed elements to seal the injury site.
- B.
The vertebrate extrinsic pathway represents an evolutionary shift towards regulated enzymatic proteolysis initiated by tissue thromboplastin, unlike the simple cellular aggregation seen in non-chordates.
- C.
Non-chordates possess a homologous extrinsic pathway, but it is initiated by the intrinsic release of Factor XII rather than tissue trauma.
- D.
The evolutionary transition to vertebrates involved replacing the complex enzymatic cascade of non-chordates with a faster, purely cellular agglutination mechanism.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Factor VII|Tissue Factor|Evolutionary Convergence
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often conflate 'cellular aggregation' (like a primary platelet plug) with 'blood coagulation' (the secondary enzymatic cascade forming a fibrin clot).
The trap lies in assuming that all organisms with circulatory fluids utilize the same homologous fibrin-based cascade, failing to recognize the evolutionary shift from simple hemocyte agglutination in non-chordates to the highly regulated proteolytic cascade (extrinsic/intrinsic pathways) in vertebrates.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Body Fluids and Circulation - Class 11 |
| Concept | Clotting Cascade Factors |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |