Video Transcript
The diagram shows a basic overview
of the blood-clotting process in a small wound. What is trapped in the net that
fibrin forms? (A) Collagen and clotting
factors. (B) Platelets and red blood
cells. (C) Calcium ions and
prothrombin. Or (D) dead skin cells and
thromboplastin.
Let’s start by reviewing what
fibrin is and its role in blood clotting. Fibrin is in insoluble proteins
formed from fibrinogen during the clotting of blood, which forms a fibrous mesh that
impedes the flow of blood. In fact, we can see in the diagram
an example of the net that fibrin forms. This fibrin net is formed over the
platelet plug that initially aggregates after the damage to a blood vessel. And as this fibrin net is forming,
it traps more platelets as well as red blood cells into what will become the blood
clot.
So, what gets trapped in the fibrin
net? Platelets and red blood cells. Therefore, the correct answer must
be (B). Platelets and red blood cells are
trapped in the net that fibrin forms.
