Reading a plaque rupture flow chart correctly

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SUMMARY

The discussion centers on interpreting flow charts related to plaque rupture and myocardial infarction (MI) in a biology context. The correct answer to the question about substances playing two different roles is identified as "Fibrinogen and antithrombin III." Fibrinogen is involved in both cross-linking platelets via the glycoprotein IIb/IIIa receptor and converting to fibrin, which stabilizes these cross-links. Antithrombin III inhibits the coagulation cascade and thrombin production, fulfilling its dual roles effectively.

PREREQUISITES
  • Understanding of biological flow charts
  • Knowledge of coagulation factors, specifically Fibrinogen and Antithrombin III
  • Familiarity with glycoprotein IIb/IIIa receptor functions
  • Basic concepts of myocardial infarction (MI) mechanisms
NEXT STEPS
  • Research the role of Fibrinogen in hemostasis and thrombus formation
  • Study the mechanisms of Antithrombin III in coagulation regulation
  • Learn about glycoprotein IIb/IIIa inhibitors in clinical settings
  • Explore advanced flow chart interpretation techniques in biological contexts
USEFUL FOR

Students in biology, particularly those studying cardiovascular physiology, medical professionals, and anyone interested in understanding the complexities of coagulation processes and flow chart analysis.

K-Feldspar
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Homework Statement


I am having a bit of trouble interpreting flow charts given in my biology question sets.

Given the following stimulus:
iv4O3tm.png

The question is :

In which of the following options does each substance play two different roles in the series of events from plaque ruprture to MI?
  1. ADP and collagen
  2. Collagen and Fibrinogen
  3. Antithrombin III and collagen
  4. Fibrinogen and antithrombin III
The answer (from my book) is:

"Fibrinogen binds to the glycoprotein (GO) IIb/IIIa leading to the cross-linking of platelets. It is also converted into fibrin which stabilises these cross-links and leads to aggregation. Antithrombin III inhibits the activation of the coagulation cascade and also inhibits the production of thrombin. The answer is 4.

Homework Equations


N/A

The Attempt at a Solution


[/B]
The answer shown above doesn't make sense to me.

The Fibrinogen square connects to the "Cross links-platelets via GPIIb/III receptor" square, which THEN connects to the "Platelet cross-links stablised" square (i.e. "Fibrinogen" doesn't directly connect to "Platelet cross-links stablised").

Why does this count as two different roles (as asked for in the question) yet e.g. "Exposure of collagen" connecting to "platelets adhere to collagen" which THEN connects to "Platelet activation release of TXA2 and ADP" not count as "two different roles".

Antithrombin III being involved in two different roles makes more sense as it has arrows pointing to 2 other boxes. None of the other options have these 2 arrows coming out.

Thank you!
 
Last edited:
Hi,

It seems I had not read the "converts fibrinogen to firbin" box that sits about the "platelet cross-links stabilised" box.

The two roles were "converts fibrinogen to firbin" and "Cross links-platelets via GPIIb/III receptor" NOT "Cross links-platelets via GPIIb/III receptor" and "platelets adhere to collagen".

Thanks
 

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