Which enzyme is responsible for the conversion of
inactive fibrinogens to fibrins?
AI-generated explanation. Check against your textbook.
Explanation:
Thrombin is the enzyme that converts soluble fibrinogen into insoluble fibrin strands, forming a clot. In the coagulation cascade, prothrombin is activated to thrombin, which then acts on fibrinogen to produce fibrin. This process is described in NCERT under digestive–circulatory related chapters, explaining how clot formation involves thrombin as the key enzyme.
🧠 Did You Know?
Renin helps convert angiotensinogen to angiotensin, influencing blood pressure, not fibrin formation. Epinephrine can affect blood flow and clotting indirectly but does not convert fibrinogen to fibrin. Thrombokinase is an older term sometimes used for the prothrombin activator complex that leads to thrombin formation, not the direct conversion of fibrinogen to fibrin.
💡 NCERT Memory Line:
Thrombin converts fibrinogen into fibrin, forming the mesh of a blood clot as described in NCERT biology chapters on blood coagulation.
Persons with 'AB' blood group are called as
"Universal recipients". This is due to:
AI-generated explanation. Check against your textbook.
Explanation:
People with AB blood group have both A and B antigens on their RBCs and no antibodies against A or B in the plasma. Therefore, they can receive blood from any ABO type without agglutination, making them universal recipients. The correct reason is the absence of anti-A and anti-B antibodies in plasma.
🧠 Did You Know?
In contrast, individuals with type O blood have anti-A and anti-B antibodies in their plasma, so they can donate to anyone but can receive only from type O.
💡 NCERT Memory Line:
Universal recipient AB: has both A and B antigens on RBCs and no anti-A or anti-B antibodies in plasma.