Question

multiple choice question
which best describes clot retraction?

platelets clump together in blood smears.

agglutinated rbcs block blood vessels during transfusion reactions.

fibrin threads contract to pull the edges of the wound together.

clots dissolve when the underlying tissue has been healed.

Explanation:

To determine the correct answer, we analyze each option:

• "Platelets clump together in blood smears" describes platelet aggregation, not clot retraction.
• "Agglutinated RBCs block blood vessels during transfusion reactions" is about agglutination in transfusion, not clot retraction.
• "Fibrin threads contract to pull the edges of the wound together" accurately describes clot retraction, where fibrin contracts to reduce the size of the clot and bring wound edges closer.
• "Clots dissolve when the underlying tissue has been healed" describes fibrinolysis, not clot retraction.

Answer:

C. Fibrin threads contract to pull the edges of the wound together.